Help! Low +12V, On-Off Restart Issues

Was just browsing a while ago when my PC suddenly restarts. To my surprise it went back on and nothing displays on screen. Checked the inside of my RIG to see the fans connected to the motherboard not working and I guess the entire motherboard is not working as well. Then it was restarting after a few second interval :(
What's going on!?!?!

This might be helpful
the +12V section reads 7.08V only.. X_______X
Is that normal or significantly low???
I don't remember that being like that.
Please help!
http://www.bjorn3d.com/forum/attachm...tid=2985&stc=1

If the 12v is below 11.6v the system will not boot. Either the OS is not picking up the correct information from the BIOS and reporting incorrect information, or the BIOS is picking up incorrect information to begin with.

Since the system just restarted out of nowhere, check the RAM first. Run Memtest86+ for a few passes and see if it reports any errors. If yes, then you have either bad RAM or a bad memory controller. More than likely a bad RAM though.

I can't.. it's doing it again.. I installed a backup generic PSU and it booted but restarted and doing it again :( it could be the mobo? I'm confused... if only my new PSU arrive I could really troubleshoot this properly :( now im stuck using my laptop

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Originally Posted by najiro

I can't.. it's doing it again.. I installed a backup generic PSU and it booted but restarted and doing it again :( it could be the mobo? I'm confused... if only my new PSU arrive I could really troubleshoot this properly :( now im stuck using my laptop

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did you check weather your mobo is shorting out somewhere, try running your system with mobo outside the case

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Originally Posted by foxmobouser

did you check weather your mobo is shorting out somewhere, try running your system with mobo outside the case

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Nope it was inside, a typical setup. THe mobo is around 5 months old, PSU 10 months. This is all of a sudden.. :(
I still think it's the mobo.. I was getting a video of it but I just can't watch it turn on and off, restart like crazy with only a few seconds interval. I think it's not powering the entire mobo fully coz I don't see anything on the screen but the fans and cooler is running.

I would pull out a multimeter and check the voltages of the PSU. If the initial PSU was going bad it could have take the motherboard down with it since your "generic PSU" exhibits the same rebooting symptoms.

Thanks for the help guys. I'd be heading to the dealer now and have everything checked

The only way to really figure this out then would be to use another MoBo, but that could be difficult particularly if you only have one of these systems.

weird turn of events. so it looks like half of the mobo's circuitry is paralyzed like it was stroked LOL.
the mobo is the issue and was sent for RMA now. I can't wait for it to get back so I'm borrowing my frend's intel P67 mobo.
Intel DP67BG
It actually looks cool, part of the intel extreme motherboard series

Did you have to reinstall windows on that temporary board?

He shouldn't need to if he is using Windows 7.

So pissed off right now. I am got my rig back, installed a different motherboard and the same thing occurs. I am certain this is a processor problem now. I'm angered that the technicians didn't figure that out and sent the motherboard for RMA. I'm using intel DP67BG which I happen to test before and it was okay. I can't even reach the BIOS and kept restarting. Post code error says 4F

What does 4F mean for that MoBo?

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Originally Posted by CDsDontBurn

What does 4F mean for that MoBo?

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processor not supported. well, even if I use the stock bios it should be supported. I personally checked this very mobo 1 month ago for a frend and it did run properly.

Only one way to find out. Try another processor!