computer power problem

Hi everyone.

I just put a build together and have a slight problem.

Whenever I turn on the computer, it powers on for about 4 seconds, turns off, then about 4 seconds later powers on noramlly and stays on.

Does anyone know why it turns off then on when I hit the on switch?

Specs:


CPU: i5 2500k

RAM: 4Gigs.

GPU: gtx 465

PSU: 650 Watt

Motherboard: ASUS P8P67 LE B3 Intel P67 LGA1155

Way in the back of my mind I think I recall that that is a known issue on some Asus Sandy Bridge motherboards.

I'd investigate Asus support and possibly look for confirmation and/or a new BIOS to solve the issue.

ignatzatsonic said:

Way in the back of my mind I think I recall that that is a known issue on some Asus Sandy Bridge motherboards.

I'd investigate Asus support and possibly look for confirmation and/or a new BIOS to solve the issue.

Tried that, still doing the same thing.

If I just let this contiune will it mess up my other hardware such as the CPU and GPU, or is it fine enough to leave it alone?

Was there a BIOS update?

I certainly wouldn't tolerate it.

I'd Google the problem and check other support sites for others having the same issue and find out what they did to resolve it. This is not an Asus-centric forum. I'd look for an overclocker's forum as they are concentrated on Asus boards.

It sounds like the PSU is detecting overvoltage, this is causing the capacitors to discharge and the machine to power off. The reason it does this is the PSU detects the overvoltage and SCR's will short out across your 5 and 12 volt rails to protect your Mobo and other components from damage.

I would replace the PSU, but that is just me.

ignatzatsonic said:

Was there a BIOS update?

I certainly wouldn't tolerate it.

I'd Google the problem and check other support sites for others having the same issue and find out what they did to resolve it. This is not an Asus-centric forum. I'd look for an overclocker's forum as they are concentrated on Asus boards.

I had the most recent version for the bios. I couldnt upgrade it.

bobkn said:

I saw that with a P8P67 Pro. I have the impression that it's not uncommon with Sandy Bridge boards. I noticed that it happened when I had no power applied to the system for a while. If I shut the PC down, and did a cold boot, the double-boot did not occur.

Warning: I had two P67 boards, one an MSI P67A-GD65, the second the P8P67 Pro. Both were bricked by firmware updates. (The MSI board was a dual BIOS one. Didn't help. I updated its firware from DOS, For the Asus board, I used EZFlash.)

All of my desktop systems have been homebuilts since 1997. I tend to do BIOS updates whenever new versions are available. (Silly, but not uncommon among enthusiasts.) I've never lot a motherboard before P67.

My point is: a BIOS update may offer improvements, but the mortality rate with P67 boards seems to be much higher than for older systems.

unfourtently I can not return the board, so hopefully it will last for at least a year or two.

Clinkz said:

It sounds like the PSU is detecting overvoltage, this is causing the capacitors to discharge and the machine to power off. The reason it does this is the PSU detects the overvoltage and SCR's will short out across your 5 and 12 volt rails to protect your Mobo and other components from damage.

I would replace the PSU, but that is just me.

So what is it ultimately, the moterboard or the PSU?

ace1 said:

Hi everyone.

I just put a build together and have a slight problem.

Whenever I turn on the computer, it powers on for about 4 seconds, turns off, then about 4 seconds later powers on noramlly and stays on.

Yup, perfectly normal for the Asus mobo. Some Gigabyte boards do that as well.

Don't worry about it, working correctly.

Regards,
GEWB

What brand is the PSU?

GEWB said:

ace1 said:

Hi everyone.

I just put a build together and have a slight problem.

Whenever I turn on the computer, it powers on for about 4 seconds, turns off, then about 4 seconds later powers on noramlly and stays on.

Yup, perfectly normal for the Asus mobo. Some Gigabyte boards do that as well.

Don't worry about it, working correctly.

Regards,
GEWB

Makes me feel a bit better, Thanks.

DeaconFrost said:

What brand is the PSU?

Ultra LSP650 650-Watt Power Supply - ATX, SATA-Ready, SLI-Ready, 135mm Fan, Lifetime Warranty w/ Registration at TigerDirect.com