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Debug LED POST and Troubleshooting
POST (hex)
25
26
41
50
Debug Code Action
00
-> C1
-> C3
->
Stopped at
25
00
-> C1
-> C3
->
Stopped at
26
C3
-> 25
-> 26
->
Stopped at
41
Power on
-> Stopped at
50
BIOS Program Definition
Enumerating PCI bus number.
Assigning memory & I/O resource -
searching for a valid VGA device &
VGA BIOS then placing it in C000:0.
Initializing display card.
Initializing onboard clock generator.
Disabling respective clock resource
to empty PCI & DIMM slots.
Initializing onboard PWM3.
Initializing onboard H/W monitor
devices.
Initializing the FDD device.
Initializing USB devices.
Possible Cause
1
.
Incompatible PCI devices.
2
.
Incompatible USB devices.
3
.
Defective graphics card.
(VGA BIOS did not initialize)
4
.
The graphics card was not installed
properly
.
1
.
Defective graphics card.
2
.
Initialized wrong BIOS process.
(Clock-gen circuit / Super IO
circuit)
Detected floppy error.
*
Mixed-up BIOS data could be one
of the causes too.
1
.
USB failed to boot. (BBS issue)
2
.
Incompatible USB devices.
Solution
1
.
Remove all PCI/PCIE devices and
leave only the graphics card to test
first.
T
est the devices one at a time to
determine the one with problem.
2
.
Remove all USB devices including
the USB keyboard and instead use a
PS/2 keyboard to test.
3
.
Replace the graphics card.
4
.
Remove and reinstall the graphics
card.
1
.
Replace the graphics card.
2
.
Clear the CMOS data.
Unplug the FDD cable and check for
errors or check the BIOS settings.
*
Replace a new BIOS chip.
1
.
Clear the CMOS data first.
2
.
Try connecting the device to
another USB port.
3
.
T
est the USB devices one by one.
4
.
Set the USB power source to 5V by
means of the 5V/5Vsb select jumper.
