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Debug LED POST and Troubleshooting
111
Appendix A
POST (hex)
Power on
00
00
A0
b8
C0
Debug Code Action
None, blank
Power on
-
> Stopped at 00
Power on
-
> 00
-
>
Reset
-
> Looping
00
-
> C1
-
> Stopped at A0
00
-
> C1
-
> Stopped at b8
00
-
> Stopped at C0
BIOS Program Definition
Nil
BIOS program starts to set VID/FID
to initialize CPU. (Boot Block area).
CPU VID is incorrect.
A0~AF Definition: Initializing
memory check code.
B0~BF Definition: Initializing
memory/devices check code
(registers).
Initializing memory.
Possible Cause
1. CMOS jumper is set at pins 2-3.
2. 5Vsb of PSU is insufficient.
(Minimum required - 2A)
1. Mixed-up BIOS data.
2. Defective CPU connection.
3. Incompatible PSU.
4. No CPU power.
5. Reset button short-circuited.
PSU does not comply with the
system’s requirement.
1. Incompatible memory modules.
2. Mixed-up BIOS data.
1. Mixed-up BIOS data.
2. Incompatible memory modules.
3. Incompatible PCI devices.
1. Probing for failed memory devices.
2. SPD value is lost or empty.
Solution
1. Set the CMOS jumper to pins 1-2
(default).
2. Replace a suitable PSU.
1. Clear the CMOS data.
2. Remove and reinstall the CPU.
3. Replace a suitable PSU.
4. Inspect the 12V connection.
5. Inspect the cable that connects the
reset button to the front panel
connector.
Replace a PSU that will provide
adequate power to the system.
1. Remove and reinstall the memory
modules.
2. Clear the CMOS data.
1. Clear the CMOS data.
2. Remove and reinstall the memory
modules.
3. Remove and reconnect the PCI
devices.
1. Make sure the memory modules are
installed properly in the slots.
2. Replace the memory modules.
General Debug LED POST and Troubleshooting