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Computer Turns On, Then Back Off (for about3 seconds), Then Back ON

Last response: in Systems
December 19, 2010 3:16:37 PM

I am building this computer, and it will turn on, the board Post code say 03 (initialize BIOS), then it will turn off, then come back on, and run fine after that.

This only happens on a cold boot, its fine if i just restart it.

Ran MemTest86 on it, there was no problems with the RAM.

Can anyone suggest what could be causing this thing to turn off?

December 19, 2010 3:28:55 PM

maybe the PSU is weak?

Is it an older 400-500 watt unit trying to run a pair of GTX570s with 4 hard drives?
December 19, 2010 3:33:47 PM

The Power Supply is a brand new 500 watt antec.

only 1 hard drive

only 1 video card

Would a power supply do this on a cold boot but be fine in a restart?
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December 19, 2010 11:37:18 PM

Anyone have any ideas?

I have put new ram in it

Installed a new motherboard

Put a older power supply in it (didn't have a new one)

nothing has changed it...

December 19, 2010 11:45:32 PM

Can you get into the bios?
December 19, 2010 11:49:07 PM

Generally, when that happens, you have a problem with a BIOS setting.

If you had a hardware fault, the system wouldn't run after restarting.
December 20, 2010 12:21:11 AM

Take your bios battery out and try to get a reset on the bios.
December 20, 2010 12:21:44 AM

Have you checked the CMOS battery?
December 20, 2010 1:10:57 AM

I was leaning away from the mother board because, this is the second board, first one was Gigabyte GA-P55A-UD3 then i put a EVGA P55 123-LF-E653-KR. They both do the same thing. I'm basically down to the CPU is the only thing that hasn't changed now. Does that make any sense though?
December 20, 2010 2:07:48 AM

Well if you have eliminated the motherboard, BIOS settings and battery then the only other component that is likely to cause this problem is the power supply. I don’t think that the CPU is likely to cause this problem.
December 20, 2010 3:54:17 AM

What BIOS setting would I look for? Kinda, at a lose here. Is there a way for me to check the power supply with a voltage meter?

Thanks for the help.
December 20, 2010 4:57:08 AM

By BIOS setting I mean ensure that the default settings for the BIOS are loaded to ensure that you are not inadvertently overclocking any component. Checking the power supply with a volt meter will not tell you if the power supply is at fault, substitution is the only reliable test that you can do to tell if the power supply is the cause of your problem.
December 20, 2010 11:51:25 AM

Ordered a new power supply, will be here on the 21. Will come back and tell you what the verdict is!
December 22, 2010 12:47:26 AM

Just tried a new power supply and its doing the same exact thing... WTF could this be???

i have tried a new

Mother board
Power supply

again it boots up turns off for about 3 seconds then turns on and run fine after that.
June 14, 2011 11:18:49 AM

Just wondering if you ever figured it out... I built a computer last week and have encountered the same exact issue... it runs amazingly aside from this strange cold start-up issue.
September 8, 2011 10:11:39 PM

Same thing over here. Asus z68 board, ssd boot drive, 8 gigs gskill sniper ram. System is rock solid stable but from a cold start powers on for a few seconds, powers off, then right back on for an otherwise normal post and boot.
September 21, 2011 3:58:14 AM

maybe it's something to do with the SSD boot drive..
my P55 board cold starts the same way so far but it might be from a total loss of power the other day, not sure yet.
comes on then goes off then comes back on and runs like a champ.
restarts good too.
very puzzling.

Well i have this same issue on my new asus z68 board...
i don't have a SSd....
Its not really that big of deal , but i just want to make sure no
hardware is at fault.

has anyone figured out how to fix this??

October 26, 2011 12:48:59 AM

Best answer selected by tomftw.