Troubleshooting
Some Common Faults
1. Single short Beep i.e.
acceptance Beep (System OK) But no display on monitor.
acceptance Beep (System OK) But no display on monitor.
Sol:
1 Check the monitor is on.
1 Check the monitor is on.
2
Check the AC socket
Check the AC socket
3
Check the brightness & contrast of monitor.
Check the brightness & contrast of monitor.
4
Check the VGA connector/ Physical condition
Check the VGA connector/ Physical condition
5
If all these are ok than Replace the Monitor
If all these are ok than Replace the Monitor
2. No display, No acceptance Beep
But System is Switching ON & there is continue long Beep.
But System is Switching ON & there is continue long Beep.
Sol:
1 this problem is related with RAM.
1 this problem is related with RAM.
2
Clean the Memory module
Clean the Memory module
3
Check the memory chip by Replace ok RAM
Check the memory chip by Replace ok RAM
4
RAM‘s Clock not match with MP clock
RAM‘s Clock not match with MP clock
5
If memory chip is ok than problem on M/B
If memory chip is ok than problem on M/B
6
Check the transistors related with memory chip
Check the transistors related with memory chip
Does
it show accurate voltage or not
it show accurate voltage or not
(3.3v
SDRAM, 2.5 DDRRAM)
SDRAM, 2.5 DDRRAM)
7
If voltage is not proper replace the transistors’
If voltage is not proper replace the transistors’
3. No display, No acceptance Beep
but System is Switching ON/OFF properly, NO continue long Beep, But Monitor is
OK.
but System is Switching ON/OFF properly, NO continue long Beep, But Monitor is
OK.
Sol:
1 Check the loose data & pwr cables connectors.
1 Check the loose data & pwr cables connectors.
2
Check the 12V power connector of M/B
Check the 12V power connector of M/B
3
If problem is still processed then remove all the devices from the system
& check the display of M/B only
If problem is still processed then remove all the devices from the system
& check the display of M/B only
4.
IF now POST screen is display than devices
IF now POST screen is display than devices
Conflict
with each others
with each others
5
IF POST Screen is not display than Check the RAM
IF POST Screen is not display than Check the RAM
4. No
display, No acceptance Beep No long Beep, System is not Switching ON.
display, No acceptance Beep No long Beep, System is not Switching ON.
Sol:
1 Check the AC Socket & UPS also.
1 Check the AC Socket & UPS also.
2
Check the loose power connector/cable (system cabinet)
Check the loose power connector/cable (system cabinet)
3
Check the M/B power connector.
Check the M/B power connector.
4
Check the SMPS (power supply).
Check the SMPS (power supply).
5
Check the front panel LED header connector
Check the front panel LED header connector
Cables
6
Check the CMOS clear jumper (it may be on
Check the CMOS clear jumper (it may be on
Clear)
7
If all these are ok than check the display
If all these are ok than check the display
With
M/B, RAM & mP
M/B, RAM & mP
8
If system is not switching than M/B faulty
If system is not switching than M/B faulty
5.
System Restart again & again completing the POST.
System Restart again & again completing the POST.
Sol:
1 firstly Check the all cables, converter,
1 firstly Check the all cables, converter,
Expansion Cards it may be loose tighten them
2
Check the M/B power connector it may be loose
Check the M/B power connector it may be loose
3
Check the actual fault i.e. H/W or S/W (CMOS)
Check the actual fault i.e. H/W or S/W (CMOS)
4
SMPS may be bad or low watting
SMPS may be bad or low watting
5
Remove the UPS & CVT from the system
Remove the UPS & CVT from the system
&
check the actual faults1
check the actual faults1
6
Check the RAM by replace healthy RAM& mp
Check the RAM by replace healthy RAM& mp
7
Check the jumper setting on M/B/Over clocking
Check the jumper setting on M/B/Over clocking
8
mP heat sink may be jam, lubricate the fan
mP heat sink may be jam, lubricate the fan
9
If all these are ok & problem is still processed
If all these are ok & problem is still processed
Than
M/B faulty
M/B faulty
6.
System Restart suddenly running time
System Restart suddenly running time
Sol:
1 Check the loose power connector/ AC Socket.
1 Check the loose power connector/ AC Socket.
2
Check the loose power connector of devices
Check the loose power connector of devices
3
The UPS & CVT also create the problem
The UPS & CVT also create the problem
4
The heavy load like air conditioner heavy
The heavy load like air conditioner heavy
Motors
should be on the separate line then
should be on the separate line then
The
computer power line
computer power line
5
The SMPS may be bad
The SMPS may be bad
Note:
In the case of dust system also restart& hang
In the case of dust system also restart& hang
Or
dust may also decrease the
dust may also decrease the
Performance
of system (speed)
of system (speed)
7. System Hang up /Halted
Sol:
1 Check the actual fault i.e. H/W or S/W (CMOS)
1 Check the actual fault i.e. H/W or S/W (CMOS)
2
Check the CPU Fan it may be bad
Check the CPU Fan it may be bad
3
Remove the dust & dirt
Remove the dust & dirt
4
Check the all cables, converter, Expansion
Check the all cables, converter, Expansion
.
Cards it may be loose, tighten them
Cards it may be loose, tighten them
5
Check the external peripheral that can be
Check the external peripheral that can be
Connected
to a system
to a system
6
Check the jumper setting on M/B
Check the jumper setting on M/B
7
If all these are ok than remove all the devices
If all these are ok than remove all the devices
I.e.
HDD, Optical Drives etc & Check
HDD, Optical Drives etc & Check
M/B,
RAM & mp display
RAM & mp display
8 If
system hang in CMOS than Replace the
system hang in CMOS than Replace the
RAM
Motherboard
Testing (Debug Card)
Testing (Debug Card)
Code
OK Memory
Error
mp Error
OK Memory
Error
mp Error
00
C0
BC
C0
BC
FF
C1
EA
C1
EA
7F
C2
C2
2F
C3
C3
26
D0
D0
27
D1+continue long Beep
D1+continue long Beep
28etc
D2
D2
D3
60
POST
Fault
Fault
1.K/B Error/ NO Keyboard
present
present
Sol:
1 Check the loose cable connector
1 Check the loose cable connector
2
Cable may be bad (Keyboard)
Cable may be bad (Keyboard)
3
K/B itself may be bad
K/B itself may be bad
4
Check the physical condition of K/B connector
Check the physical condition of K/B connector
on
M/B
M/B
5
If all these are ok & problem is still processed
If all these are ok & problem is still processed
than
replace the keyboard port
replace the keyboard port
2.Floppy
disk drive Fail
disk drive Fail
Sol:
1 Loose data & power connector of FDD
1 Loose data & power connector of FDD
2
Data cable may be bad (FDD_
Data cable may be bad (FDD_
3
Load the CMOS defaults
Load the CMOS defaults
4
Floppy disk drive itself may be bad
Floppy disk drive itself may be bad
5
Check the physical condition of FDD ports
Check the physical condition of FDD ports
on
M/B
M/B
3.CMOS Checksum error
Sol:
1 CMOS battery has gone bad replace it.(weak)
1 CMOS battery has gone bad replace it.(weak)
2
Check the CMOS jumper it may set on clear
Check the CMOS jumper it may set on clear
3
If all these are ok than check the CMOS battery rack it may be bad
If all these are ok than check the CMOS battery rack it may be bad
4.Invalid
System Disk, Insert System Disk & Press enter when ready
System Disk, Insert System Disk & Press enter when ready
OR
Disk Boot failure, Insert System Disk & Press enter when ready
Disk Boot failure, Insert System Disk & Press enter when ready
OR
Disk I/O errors
Disk I/O errors
Sol:
1 Hard Disk check in POST Detected or not
1 Hard Disk check in POST Detected or not
2
If not Detected Check the power & data cable
If not Detected Check the power & data cable
3
Data connector may be bad on HDD
Data connector may be bad on HDD
4
Check the Master/Slave jumper setting.
Check the Master/Slave jumper setting.
5
Also check BIOS setting (device may be
Also check BIOS setting (device may be
Disable)
6
Check the root directory (C 🙂 it may be
Check the root directory (C 🙂 it may be
5.Computer gives message: Your
computer has a serious problem Back up your data& replace
computer has a serious problem Back up your data& replace
Your
HDD as soon as possible
HDD as soon as possible
Sol:
you have must enable your SMART
you have must enable your SMART
Option
in CMOS, this option check the
in CMOS, this option check the
Bad
sectors on HDD
sectors on HDD
Follow
the error message & back up your
the error message & back up your
Data
on to another drive, if you’re HDD has
on to another drive, if you’re HDD has
Under
warranty, than replace If not than fix
warranty, than replace If not than fix
The
bad sectors with NDD
bad sectors with NDD
Your POST screen some times
Hangs up
Hangs up
Sol: 1 Check the power
connector of devices
connector of devices
It
may loose
may loose
2.
Data cables also may be bad
Data cables also may be bad
3
Remove all the Pwr & Data cables from
Remove all the Pwr & Data cables from
Devices
4.
Go to the CMOS setting if system not hangs
Go to the CMOS setting if system not hangs
Now
than devices create problems
than devices create problems
On
POST Primary master show none
POST Primary master show none
Secondary
master show none
master show none
Sol
.it means devices are not detected
.it means devices are not detected
Check
the power connector &data cable it may
the power connector &data cable it may
Loose
or bad
or bad
2
Check the jumper setting (Master, Slave)
Check the jumper setting (Master, Slave)
3 Check
CMOS Setting
CMOS Setting
4 If
problem is still processed than Check the IDE
problem is still processed than Check the IDE
Port on M/B it may bad. Replace
the IDE port
the IDE port
Motherboard
faults
faults
System/ Motherboard is giving the
display but restart again &again after completing
display but restart again &again after completing
thePOST Sol:
1 first of all visualizes the M/B carefully. There can be some burnt or damage
track
1 first of all visualizes the M/B carefully. There can be some burnt or damage
track
components
2
check the electrolytic capacitor it can be damage
check the electrolytic capacitor it can be damage
3
checks the crystal oscillator mounting near the clock generation chip replace
it
checks the crystal oscillator mounting near the clock generation chip replace
it
4
The clock generation chip may be bad
The clock generation chip may be bad
5
Bad BIOS
Bad BIOS
6
Reinsert the BIOS
Reinsert the BIOS
7 Press
the north bridge and the south bridge chipset with a great
force with the help of your thumb.
the north bridge and the south bridge chipset with a great
force with the help of your thumb.
.
M/B is dead no display on
monitor and the DEBUG card is giving 00; FF; 88 codes
monitor and the DEBUG card is giving 00; FF; 88 codes
but it is switching on
properly.
properly.
Sol:
1 First of all checks the physical condition of M/B i.e. burnt or worm out
tracks on the M/B.
1 First of all checks the physical condition of M/B i.e. burnt or worm out
tracks on the M/B.
2.
BIOS may be bad or incorrectly flashed
BIOS may be bad or incorrectly flashed
3.
check the electrolytic capacitor if found
bad
replace it.
check the electrolytic capacitor if found
bad
replace it.
4.
While replacing the electrolytic capacitor you should take care for 1. The
volume or WVC work voltage and capacitance should be same 2. Capacitor size
should be same 3. Polarity should be correct otherwise it will blast after some
time.
While replacing the electrolytic capacitor you should take care for 1. The
volume or WVC work voltage and capacitance should be same 2. Capacitor size
should be same 3. Polarity should be correct otherwise it will blast after some
time.
4
bad BIOS replace the BIOS with the same
bad BIOS replace the BIOS with the same
5
super I/O chip may be bad replace it.
super I/O chip may be bad replace it.
6
check the voltage regulator i; e MOSFETS
replace if
found bad
check the voltage regulator i; e MOSFETS
replace if
found bad
M/B is dead no display on
monitor & the DEBUG card is
monitor & the DEBUG card is
giving
C0;C1;C2;C3;D0;D1;D2;D3etc. it is switching on properly also the
C0;C1;C2;C3;D0;D1;D2;D3etc. it is switching on properly also the
internal speaker is giving the
continuous long beep.
continuous long beep.
Sol:
check some burn or worn out track near the RAM slots and Mp sockets
check some burn or worn out track near the RAM slots and Mp sockets
2 :
check the operating voltage i;e 3.3 V for SDRAM and 2.5V for DDRSDRAM into the
RAM slot.
check the operating voltage i;e 3.3 V for SDRAM and 2.5V for DDRSDRAM into the
RAM slot.
If
this voltage is absent then replace the voltage
this voltage is absent then replace the voltage
Regulator
[MOSFETS]
[MOSFETS]
3
clean the RAM slot with acetone .it may be dirty or corrosive camp
clean the RAM slot with acetone .it may be dirty or corrosive camp
M/B
is dead and is not switching on.
is dead and is not switching on.
Sol:
1 check the physical condition of M/B i.e. tracks
1 check the physical condition of M/B i.e. tracks
2
the super I/O chip may be bad. Replace it.
the super I/O chip may be bad. Replace it.
3
south bridge chips may be bad.
south bridge chips may be bad.
4
some times the M/B inner layers may be damage so in this condition the M/B
cannot repair further.
some times the M/B inner layers may be damage so in this condition the M/B
cannot repair further.
The M/B is switching ON/OFF
properly & is giving the display but it hanghalt after completing the
POST or after 10-15 minutes.
properly & is giving the display but it hanghalt after completing the
POST or after 10-15 minutes.
Sol:
1 check the physical condition i;e tracks & Open
1 check the physical condition i;e tracks & Open
Burnt
capacitor
capacitor
2
check the M/B’s power connector .it may be
check the M/B’s power connector .it may be
Dry
solder or spark.
solder or spark.
3
check the electrolyte capacitor
check the electrolyte capacitor
4
Also check the voltage regulator i;e MOSFETS
Also check the voltage regulator i;e MOSFETS
5
Some time the BIOS may be or incorrectly
Some time the BIOS may be or incorrectly
Flashed
so reflash or replace it
so reflash or replace it
M/B is giving the display but
the K/B is not working and during POST the following
the K/B is not working and during POST the following
message is display.
“Key
board error”
board error”
Or
“No
key board present”
key board present”
1
The K/B connector may be dry solder
The K/B connector may be dry solder
2
Some time there is some burnt track or
Some time there is some burnt track or
component
near the K/B connector
near the K/B connector
3
if still problem proceed than bad super I/O chip
if still problem proceed than bad super I/O chip
The M/B is giving the display but
parallel port is not working
parallel port is not working
Sol:
1 Check the resistor network mountings near the
1 Check the resistor network mountings near the
parallel
port
port
2 Check
the track from parallel port to super I/O chip
the track from parallel port to super I/O chip
3 Dry
soldered or bad parallel port
soldered or bad parallel port
4 Some
time the super I/O chip may bad
time the super I/O chip may bad
5 Replace
the super I/O Chip
the super I/O Chip
The M/B giving the displays but one of
the serial port is not working
the serial port is not working
Sol:
1 serial port may be dry solder
1 serial port may be dry solder
2
check the track from serial port to GD75232
check the track from serial port to GD75232
chip
and from GD75232 to Super I/O chip
and from GD75232 to Super I/O chip
3
GD 75232 chip may be bad
GD 75232 chip may be bad
4
some time super I/O chip may be bad
some time super I/O chip may be bad
Ø M/B is giving the display
but FDD connector is not working
but FDD connector is not working
Sol:
1 dry solders FDD connector
1 dry solders FDD connector
2
Bad floppy drive connector
Bad floppy drive connector
3
visualize the physical condition of connector
visualize the physical condition of connector
and
tracks between the FDD Connector and
tracks between the FDD Connector and
super
I/O chip
I/O chip
4
the super I/O chip may be bad
the super I/O chip may be bad
The M/B is giving the display but
not audio out put
not audio out put
Working
Sol:
1 check the audio controller is not disable trey
1 check the audio controller is not disable trey
jumpers on M/B some times
The
audio controller is disabling through
audio controller is disabling through
BIOS
so first of all check these setting
so first of all check these setting
2
If these are ok then check the crystal
If these are ok then check the crystal
Oscillators
and voltage regulator IC
and voltage regulator IC
LM
78xx; LM 317; LM 334mounted near the
78xx; LM 317; LM 334mounted near the
audio
controller chip
controller chip
3
Bad BIOS so either replace it or refresh it
Bad BIOS so either replace it or refresh it
4
The audio controller may also be bad.
The audio controller may also be bad.
