+12v fluctiations - Corsair 650TX and No beep, no boot, problem

Kelorian · 11-07-2009, 04:49 AM

Excuse my english not a native speaker.

My 650TX is 1 year now and has been working fine, however I had 2 occasions where my computer wouldn't turn on. It would turn on for 5 seconds them power off, then on, off, and so on. No beeps. No boot.

Unplugged the PSU cables, nothing. Cleared BIOS, nothing. Try everything again. After 2-3 times doing these procedures, the computer comes back to life.

These 2 occasions where the computer stopped working were in a interval of 4 months or more, so I don't know what happened, maybe a BIOS problem or a bad contact. Idk.

The second time this happened, I tried removing the cables and plugging them back, didnt work. So, I went for a BIOS clear, and it worked.

Anyway, the computer works fine, the +12v stays between 11.85 and 11.92 in idle, the 3.3 stays in 3.248.

The thing that is making me worry was a test I did last night.
I started Aion (a mmorpg) in windowed mode, started EasyTune5 (Gigabyte program to watch voltages) and watched the fluctuations.

I do know that the 12v should fluctuate, because of the load... but my +12v was fluctuating a little too much.

It was doing 11.85 - 11.92 most of the time, but sometimes it would drop to 11.668 or even 11.5XX. I saw 11.4XX once...

So, is it normal?

I have a Gigabyte EP43 and a Ati 4870, with a c2d e8400.
and that is it. No drives, one small 7200 320gb HD and like 5 80mm fans in the case.

Thanks in advance.
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zerocool84 · 11-07-2009, 05:50 AM

Overclocked at all?

cmdrdredd · 11-07-2009, 08:05 AM

when the +12v gets low like that it can cause stability problems for both your video card and the CPU. Corsair will replace it pretty much no questions asked if you contact them and mention the PSU not booting your system.

HOOfan 1 · 11-07-2009, 11:47 AM

You cannot accurately read your voltages with software...only a well calibrated multimeter will help you determine the actual voltage.