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Computer don't boot after power outage only if i reset bios asus p5q

Last response: in Components
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October 8, 2011 12:27:06 PM

Well as the it says above, if i had an power outage or if i remove the plug. My computer starts but don't even start the POST. The fans, HDD are working but no beeps or anything on the screen.
I was thinking about the PSU, but then i've notice that if i reset the bios, the system boots.
Any ideas of what is causing this?

Specs:
Motherboard Asus P5Q-SE Plus
Cpu Intel Quad2core Q6600
Rams 2 Kingston DDR2 1GB each
HDD WD Caviar Blue 500GB
VGA MSI NX7300 with Nvidia 7300GT GPU
PSU Tsunami KY-500ATX
a c 274 ) Power supply
October 8, 2011 2:38:08 PM

Have you checked the cmos battery it might be dead or close to it.
It saves your bios info.
A dead or dying one will not save your bios setting.
I could be wrong but $4 max for a new one is worth a try imo.
October 8, 2011 5:05:06 PM

Hi davcon thks for the interest in helping. I don't think is the cmos battery because the clock is allways right.
Now is worst. Everytime I turn on the computer, it just turn on the fans, shutdown himself, turn on himself again and only the fans and HDD working, I have to reset bios with the jumper everytime to make it work, even if i don't make any changes there.
I'll get a borrowed PSU to try and see if it works.
!