BIOS POST failure.

Mercury mother board / Kob 845 nfsx 1.0
January 5, 2011 at 11:31:50
Specs: Windows XP, PentiumIV
Motherboard Mercury KOB845 NFSx1.0 . DDR 256 mb RAM. CPU Pentium IV.
windows XP. Power supply tested externally and on other computer - working fine.
On board LED (standby supply) lights up. Power ON switch on panel pressed but no
power to cpu, fan, hard disc , etc. Appears to be POST failure. BIOS reset by battery
removal and also using jumper. No improvement. No beeps.
Noticed that with BIOS batter removed, main power to cpu, fan, hard disc etc. comes
ON without pressing Power On switch on panel. Power ON LED on panel blinks
continously and disc activity LED glows steadily showing no activity. Of course
no video.
Suspect BIOS chip problem. Cannot do BIOS flashing without main power to
board.

See More: BIOS POST failure.

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#1
January 5, 2011 at 13:11:13
Post the make/model wattage & amperage specs of the power supply & exactly how you tested it.

What makes you think the BIOS has anything to do with the problem? It's obviously a hardware issue. And why did you have the power cord connected while the CMOS battery was out? If you had the clear CMOS jumper in the "clear" position while there was still power to the board, you may have fried the board.


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#2
January 5, 2011 at 13:13:28
Assuming you haven't fried the board, as mickliq stated, try booting up without any hard drives or optical drives connected, and with only 1 stick of RAM.

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#3
January 5, 2011 at 23:46:49
Tried booting without hard drive and optical drive. No beeps, Used only
one RAM stick. There is provision for 3 sticks. Tried single RAM stick
in all three positions one by one. No improvement.

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Related Solutions

#4
January 6, 2011 at 00:14:02
Power supply Mercury 300W Model KOB AP 4300XA Input 115AC/230AC 8A/4A 60Hz-50Hz
Output +3.3V/28A ,+5V/30A ,+12V/15A, -5V/0.3A,-12V0.8A, +5VSB/2A
PS_ON GREEN, POK Gray COM/RETURN.
Externally checked power supply by grounding PS_On (pin14) to COM
and starting supply. Then checked voltages with DMM. All normal.
Did not check on load. Instead installed power supply on second working
computer and checked. Performance normal.
Removed by BIOS battery for clearing (after switching off power) and
by mistake switched on power before replacing battery.
The hard ware (disc drive, com drive, RAM and graphic card) all
from a working computer used earlier (P3 CPU)

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