Motherboard problem??

December 31, 2011 at 01:52:38
Specs: Windows XP sp2, 256
Hi
When I start my pc, it doesn't boot-up (no info is displayed on my screen, instead the minitor power light changes from green to orange/yellow) but the cpu fan and pcu fan are running.
This same monitor works perfectly on my other pc

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#1
December 31, 2011 at 02:41:23
There could be any number of component failures preventing your system from booting. First step is to re-seat all cards & cables to see if it isn't just a loose connection somewhere.
Next possibility is faulty powersupply. Without a known good powersupply you cannot test further.
After that you need to strip the system down to barebones. IE: Disconnect all drive power & data cables, remove all but 1 stick of ram, remove any/all PCI cards, Connect to onboard graphics and remove any AGP graphics card if onboard is available. Leave only powersupply, motherboard with CPU Heatsink& fan, 1 stick ram, keyboard & graphics. Now connect power and see if you can boot up into bios. If so then add back one component at a time until failure occurs.
If no barebones boot try removing all ram. Do you get any bios beeps? If yes then CPU at least is ok and motherboard functions. If no bios beeps at all then your problem is either failed CPU or motherboard. Given you are running XP on a system with only 256mb ram it is obviously an older unit maybe P3 or P4 or similar vintage AMD. Not really worth spending much on replacement parts.

Goin' Fishin' (Some day)


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#2
January 7, 2012 at 15:49:37
I've already tried everything exactly as you explained ... I even checked the cpu on a differnt computer with a matching sochet and it worked, but when I put it back it couldn't boot (but there is power coming through, since the fans are running) - same problem!
Everything now points to the m-board. On this subject I at least tried by removing the battery and clearing CMOS ... what else can I try to resolve a m-board issue???

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#3
January 7, 2012 at 16:19:16
Spinning fans does not prove that the powersupply is fully functional. It is possible for a powersupply to partially fail while still providing +12V to run fans. Did you try with a known good powersupply? If so then your motherboard has failed. Check for bulging or leaking capacitors. A common indicator of mobo failure.

Goin' Fishin' (Some day)


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