Problems with my pc after an overcurrent

[Baranchik]

a couple of days ago, I had a power outage because of an excessive load.

my pc wasn't connected to a UPS.
when I tried to turn it on, i realized it doesn't boot my os , or any other os for that matter (and i tried many live cd's). it usually hangs in the first second, sends a kernel panic (it's a linux), during acpi loading or something like that, just after cpu profile is loaded.

the thing is, it behaves very strangely.
I had done some memtest86+ test, and they all come out clean, but i've noticed that when I complete the test, the os does boot (usually the boot).

when i turn it off, it doesn't boot again.

also, something strange, when I save changes to bios, sometimes it turns off instead off rebooting, which it usually does.

I've also opened the case, did a little cleaning and moved ram to different slots, and no change.

I'll appreciate if anyone can shed some light on this, because even though my pc is only 4 months old, warranty is not that easy to get when it comes to inconsistencies like this.

 

[denis280]

PSU.when you start you pc.the psu is probably faulty.then when you do the memtest it runs for such time and get stable.

 

[Baranchik]

Tested your theory, and I put another PSU.
Same issue.

Something I forgot to mention, sometimes the bios turnes off one core of the 4 I have, (Phenom II X4 965) and brings up only the first 3.

Today I had a complain from the bios that the overclock profile can't be set up.
This "OC" is my usuall setup.

 

[denis280]

The mobo should turn off cores.so am pretty sure your CPU is faulty

 

[splat_ed]

My first thoughts would be the PSU as well, but you've ruled that one out.
Second thought for me is memory or motherboard... memory you've checked as well.

As you've also mentioned the OC profile, maybe just try putting the BIOS at defaults/safe settings?

I would strip it down to the bare minimum needed to boot and start from there. If you've got the time and spare parts, just work through systematically until you find the bad 'un.

It might be worth just getting it replaced if it is still under warranty. Sometimes it's just not worth spending ages trying to figure out what's wrong especially if there's a chance that another part is waiting in the wings to wreak havoc later on...