Number of Beeps Solving Problem
1 short
Beep System is OK(Acceptance Beep)
2/3/4 short
Beep Check
the RAM & Video adapter
Card properly connected.
5
short Beep Check the RAM properly installed or
not Check the mP . Replace
the mP & M/B.
6
short Beep Try attaching a difference K/B.
7
short Beep Replace the CPU & M/B
8
short Beep Check the Video Card (Display) 9 short Beep Check the BIOS Chip is properly
attached or not
10 short Beep CMOS Chip Problems
11 short Beep Cache memory Chip
1Long 3 Short Beep RAM Problem
1Long 8 Short Beep Video Card Problem
Continue long Beep RAM Problem
Troubleshooting Some Common Faults
Ø
Single short Beep
ie acceptance Beep (System OK) But no display on monitor.
Sol: 1 Check the monitor is on.
2 Check the AC socket
(DMM)
3 Check the brightness &
contrast of monitor.
4 Check the VGA connector/ Physical condition
5 If all these are ok than
Replace the Monitor
Ø
No display, No
acceptance Beep But System is Switching ON & there is continue long Beep.
Sol:
1 This problem is related with RAM.
2 Clean the Memory module
3 Check the memory chip by Replace ok
RAM
4 RAM ‘s Clock not match
with MP clock
5 If memory chip is ok than
problem on M/B
6 Check the transistors
related with memory chip
does it show accurate
voltage or not
(3.3v SDRAM ,2.5 DDRRAM)
7 If voltage is not proper
replace the transisters
Ø
No display, No
acceptance Beep But System is Switching ON/OFF properly, NO continue long Beep
, But Monitor is OK.
Sol:
1 Check the loose data & pwr cables connectors.
2 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
4.
IF now POST screen is display than devices
Conflict with each others
5
IF POST Screen is not display than Check the
RAM
·
No display, No
acceptance Beep No long Beep, System is not
Switching ON
Sol:
1 Check the AC Socket & UPS also.
2 Check
the loose power connector/cable(system cabnet)
3 Check the M/B power connector.
4 Check the SMPS( power supply).
5 Check the front panel LED header
connector
cables
6 Check the CMOS clear jumper (it may
be on
clear )
7 If all these are ok than check the
display
with M/B,RAM & mP
8 If system is not switching than M/B
faulty
Ø
System Restart
again & again completing the POST.
Sol:
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
3 Check the actual fault ie H/W or
S/W(CMOS)
4
SMPS may be bad or low watting
5 Remove the UPS & CVT from the system
& check the actual faults1
6 Check the RAM by
replace healthy RAM& mp
7 Check the jumper setting on M/B/Over
clocking
8
mP heat sink may be jam , lubricate the fan
9 If all the are ok & problem is
still processed
than M/B faulty
·
System Restart
suddenly running time
Sol:
1 Check the loose power connector/ AC Socket.
2 Check the loose power connector of
devices
3 The UPS & CVT also create the
problem
4 The heavy load like air conditioner
heavy
motors should be on the
separate line then
the computer power line
5 The SMPS may be bad
Note
: In the case of dust system also
restart& hang
or dust may also decrease the
performance of system (speed)
Ø
System Hang up /Halted
Sol:
1 Check the actual fault ie H/W or
S/W(CMOS)
2
Check the CPU Fan it may be bad
3
Remove the dust & dirt
4
Check the all cables, converter, Expansion
.
Cards it may be loose, tighten
them
5
Check the external peripheral that can be
connected to a system
6
Check the jumper setting on M/B
7
If all these are ok than remove all the devices
ie HDD , Optical Drives etc
& Check
M/B , RAM & mp display
8
If system hang in
CMOS than Replace the
RAM
Motherboard
Testing (Debug Card)
Code
OK Memory Error mp Error
00 C0 BC
FF C1 EA
7F C2
2F C3
26 D0
27 D1+continue long Beep
28etc D2
D3
60
POST Fault
Ø
K/B Error/ NO
Keyboard present
Sol:
1 Check the loose cable connector
2 Cable may be bad (Keyboard)
3 K/B itself may be bad
4 Check the physical condition of K/B
connector
on M/B
5 If all these are ok & problem is
still processed
than replace the keyboard port
Ø
Floppy disk drive
Fail
Sol:
1 Loose data & power connector of FDD
2 Data cable may be bad (FDD_
3
Load the CMOS defaults
4
Floppy disk drive itself may be bad
5
Check the physical condition of FDD ports
on M/B
Ø
CMOS Checksum
error
Sol: 1 CMOS battery has gone bad replace it.(weak)
2 Check the CMOS jumper it may set on
clear
3 If all the are ok than check the
CMOS battery
rack it may be bad
Ø
Invalid System
Disk, Insert System Disk & Press enter when ready
OR
Disk Boot failure, Insert System Disk & Press enter when ready
OR Disk I/O errors
Sol:1 Hard Disk check in POST
Detected or not
2 If not Detected Check the
power & data cable
3 Data connector may be bad
on HDD
4 Check the Master/Slave
jumper setting.
5 Also check BIOS setting
(device may be
disable)
6 Check the root directory
(C: ) it may be
formatted
Ø
Computer gives
message: Your computer has a serious problem Back up your data& replace
Your HDD as soon as possible
Sol:
you have must enable your SMART
Option in CMOS ,this option
check the
Bad sectors on HDD
Follow the error
message & back up your
data on to another
drive, If your HDD has
under warranty , than
replace If not than fix
the bad sectors with
NDD
Ø
Your POST screen
some times Hangs up
Sol:
1 Check the power connector of devices
It may loose
2. Data cables also may be bad
3 Remove all the Pwr & Data cables
from
devices
4. Go to the CMOS setting if system
not hang
now than devices create problems
·
On POST Primary master show none
Secondary master show none
Sol
1.t means devices are not detected
Check the power connector &data
cable it may
Loose or bad
2
Check the jumper setting(Master ,Slave)
3
Check CMOS
Setting
4
If problem is still processed than Check the
IDE
Port
on M/B it may bad. Replace the IDE port
Motherboard faults
Ø
System/
Motherboard is giving the display but restart again &again after completing
the POST
Sol:
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
3
checks the crystal oscillator mounting near the clock generation chip replace
it
4
The clock generation chip may be bad
5
Bad BIOS
6 Reinsert the BIOS
7 Press the north bridge and the south bridge
chipset with a great force with the help of your thumb.
.
Ø
M/B is dead no
display on monitor and the DEBUG card is giving 00; FF; 88 codes but it is
switching on properly.
Sol:
1 First of all check 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
3 check
the electrolytic capacitor if found bad ] replace it.
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
5 super I/O chip may be bad replace it.
6 check the voltage regulator i;e MOSFETS
replace if found bad
Ø
M/B is dead no
display on monitor & the DEBUG card is giving C0;C1;C2;C3;D0;D1;D2;D3etc. it is
switching on properly also the internal speaker is giving the continuous long
beep.
Sol:
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.
If
this voltage is absent then replace the voltage
regulator
[MOSFETS]
3 clean the RAM slot with acetone .it may be
dirty or corrosive camp
Ø
M/B is dead and
is not switching on.
Sol:
1 check the physical condition of M/B i.e. tracks
2 the super I/O chip may be bad. Replace
it.
3 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.
Ø
The M/B is
switching ON/OFF properly & is giving the display but it hang\halt after
completing the POST or after 10-15 minutes.
Sol: 1 check the physical condition i;e tracks
& Open
Burnt capacitor
2 check the M/B’s power connector .it
may be
dry solder or spark.
3 check the electrolyte capacitor
4 Also check the voltage regulator i;e
MOSFETS
5 Some time the BIOS may be or
incorrectly
flashed so reflash or replace it
Ø
M/B is giving the
display but the K/B is not working and during POST the following message is
display.
“Key
board error”
Or
“No
key board present”
1 The K/B connector may be dry
solder
2 Some time there is some
burnt track or
component near the K/B
connector
3 if still problem proceed
than bad super I/O chip
Ø
The M/B is giving
the display but parallel port is not working
Sol: 1 Check the resistor network mountings
near the
parallel port
2
Check the track from parallel port to super
I/O chip
3
Dry soldered or
bad parallel port
4
Some time the
super I/O chip may bad
5
Replace the super
I/O Chip
Ø
The M/B giving
the displays but one of the serial port is not working
Sol: 1 serial port may be dry solder
2 check the track from serial port to
GD75232
chip and from GD75232 to Super I/O
chip
3
GD 75232 chip may be bad
4 some time super I/O chip may be bad
Ø
M/B is giving the
display but FDD connector is not working
Sol:
1 dry solders FDD connector
2 Bad floppy drive connector
3 visualize the physical condition of
connector
and tracks between the FDD Connector
and
super I/O chip
4 the super I/O chip may be
bad
Ø The M/B is giving the display but not audio out put
working
Sol: 1 check the audio controller
is not disable trey
& jumpers on M/B
some times
The audio controller is
disabling through
BIOS so first of all
check these setting
2 If these are ok then check
the crystal
oscillators and voltage
regulator IC
LM 78xx; LM 317; LM
334mounted near the
audio controller chip
3 Bad BIOS so either replace
it or refresh it
4 The audio controller may
also be bad.
SMPS Voltages
Yellow
|
Blue
|
Red
|
White
|
Purple
|
Black
|
Green
|
Gray
|
|
+3.3V
|
+12V
|
-12V
|
+5V
|
-5V
|
+5V
SB
|
Gnd
|
Ps on
|
PG
|
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