DS3p switching on and off

[sswats]

I posted this in the DS3 guide topic, but its escalated and I need urgent help.

I have a DS3P with an E4300 running at 300fsb x 9 (2.7ghz).

Just had a power outage and my PC obviously lost power (no UPS).

When i tried to switch back on, I'd get a weird beep which I haven't heard before and nothing.
a few more tries, the beep changed but still nothing.

eventually it managed to boot but it had lowered the clock speed of my E4300 back to default. all the other settings seem to stay the same.

I go into the bios and check the PC health and next to 3.3v it says "Fail" in bright red.
I tinkered with the fsb voltage and 3.3v went back to "OK".
tried to boot windows it crashed and the 3.3V went back to fail.

My clock speed is back down to 1.8 and 3.3v says "OK" and windows is now running.

And now for God knows what reason the power cut out again. And now the PC is totally refusing to switch on. I started getting that beep again, so i reset the cmos, and now it switches on for 3-4 seconds then off again then on again then off again then on again etc.

Anyone please help!
Could it be this 3.3 V fail. what is that exactly?

edit- I forgot to mention. Generally when I leave the computer off for a long while it does this on then off thing when i try to switch it on. And takes a few goes to get it going. but i've been trying for the last hour on this thing and nothing.

 

[Corasik]

I believe most motherboards power the memory chips from the 3.3v rail. If this has failed in your PSU (or is weak and/or noisy) then it will certainly affect your computer.

 

[sswats]

So only option is to try a different PSU? or is this a motherboard problem?

 

[Antar Bolaeisk]

Not sure about the rest of the problems but the power on/off situation happens to me the odd time. What I normally do is just isolate the PSU by either switching it off or pulling out the plug. The computer will still try to boot but won't have enough power to proceed naturally.

After that, wait a minute then plug back in the lead or switch on the PSU.

That works for me but in your case something else mught be seriously wrong.

What PSU do you have, what power rating?

 

[sswats]

it was a tagan.

I tried some budget PSU and system worked.
Tried the tagan on another system and it didn't work.

So bought a new corsair PSU and everythings up and running again.

thanks for the help guys/