Help with troublesome motherboard

[Jure Sah]

Hello,

I have an old PC with a motherboard that doesn't have any documentation
nearby.

It used to work great, but today I found it in a forzen state (blank
screen) that and didn't want to boot up again for a diffirence. I
supposed the AT PSU was to blame, since some connector pins were visibly
charred. However when I replaced the PSU and all suspicious components,
the computer still refuses to boot.

It seems the network card, which is connected to the board with a
special cable (WOL I think) powers up and begins passing around packets,
the harddrives spin up and employ their heads, but the CPU fan is
perfectly still and there is nothing happening, no beep, no keyboard
start, blank screen, etc, nor is the CPU getting any less cold.

Since the motherboard also has an ATX plug, I am going to try with an
ATX PSU and see what happens, the only problem is I don't know which
pins on the motherboard are supposed to be bridged to turn it on (ATX
power switch plugs).

Here is what I got at the moment:

POWER LED PC SPEAKER
| | | | | |
o o o o o o o o o ISA SLOT HERE
o o o o o o o o
| | | | | |
RESET SW | | HDD LED
TURBO LED

I suppose I'd be able to get the remaining pin meanings if I knew what
motherboard brand and model this is, but I do not. Can you help me there?

As said the motherboard has AT and ATX power plug options; it has two
onboard IDE controllers, floppy, etc; it has 3 PCI slots, 2 ISA slots,
AGP (x2 max I think), 2 SDRAM slots and a CPU slot (not socket). It has
an apparently non-standard USB connector (pinset), two COM port
connectors, LPT port connector, PS/2 mouse connector and large DIN
keyboard plug socket. The CPU in it is a 300 MHz Penitum II and the
chipset has a green raidator with "Soyo" on it, the second chip of the
chipset also has a label saying "Soyo".

Hope I can fix this bugger.

Thanks. =)

--
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Primary function: Coprocessor
Secondary function: Cluster commander

Yes I'm a therian:
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Creationism & Darwin:
"The bible says humans were
supposed to use animals to
do work for them and I like
to work so I must be an animal!"

 

[Don]

Jure Sah wrote:
[snippity-snip]

It used to work great, but today I found it in a forzen state (blank
screen) that and didn't want to boot up again for a diffirence. I
supposed the AT PSU was to blame, since some connector pins were visibly
charred. However when I replaced the PSU and all suspicious components,
the computer still refuses to boot.

It seems the network card, which is connected to the board with a
special cable (WOL I think) powers up and begins passing around packets,
the harddrives spin up and employ their heads, but the CPU fan is
perfectly still and there is nothing happening, no beep, no keyboard
start, blank screen, etc, nor is the CPU getting any less cold.

With apologies to DeForest Kelley, "It's dead, Jim."

If something died on the motherboard in such a way that it shorted out
the PSU and charred some of the pins, it's a dead certainty that other
portions of the board are also fried. (You might find it instructive to
remove the board and look for damaged or fried traces on the underside.)