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Troubleshoot MB after PS failure

Last response: in Motherboards
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January 21, 2013 7:43:34 PM

Hi,

Working system: Intel PS945PSNLK MB/D820 CPU/775 socket
PS ate itself.
Obtained new PS, confirmed good.
Stripped MB all cards/memory... and connectors and removed battery >15min.
now upon application of power, stripped as above except CPU in place and battery returned to socket, PS connectors attached; onboard standby power indicator light flashes green & onboard speaker clicks both ~4hz. removal of either CPU or 12v 2x2 connector allows normal PS and fan operation.

Bad MB/onboard component or CPU only?

Afraid to buy and insert CPU for test if MB is gone...

Thanks!

More about : troubleshoot failure

January 22, 2013 1:01:56 AM

The system will not boot without RAM and will beep roughly like you describe.
January 22, 2013 3:22:56 AM

Thanks, Man,

It does the same thing with RAM. Not trying to get it to boot, just power on and accept power. If I can get it that far, I'll install 1 stick RAM and video card & just try to see BIOS... (baby steps)

there is no beep. The light flashes and the spkr clicks about 4x/sec (sync) - looks like a power oscillation indicating something's not right - just can't determine if MB or CPU is causing the oscillation.

If CPU removed or 12v 2x2 disconnected (still no RAM), the light is steady green and all fans/PS run normally and spkr is silent.

Either MB or CPU is bad - which?

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January 25, 2013 2:42:37 AM

c'mon - nobody's ever seen this before - ?
March 1, 2013 5:00:41 AM

ok - for future reference, the CPU is fine, replaced MB and all's well...
!