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Computer turns on and off

Last response: in Systems
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August 18, 2010 2:47:59 AM

Hi, I recently assembled a new PC. when I turn it on, all fans and lights turn on... for one second, after that all components turn off, 3 seconds later it turns on again and so on repeatedly.
it doesn't even POST.
First thing I did was to test the system with other (VERY old) power supply everything worked fine, no problem.
so I thought the new PSU was damaged, for my surprise, when I put it in other (VERY old) computer... it work!!
I have build a lot of systems and it's the first time I see this
How is it possible?
Is there a problem with the psu?

foxconn p55a s
antec truepower 550w
core i5 750
4GB g.skill ripjaws
nvidia geforce 8500gt

More about : computer turns

August 18, 2010 2:04:23 PM

You might have solved your own problem. Get a new PSU.
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August 20, 2010 7:48:05 PM

It's a shame but yes, I'll buy a new one.
I just want to be sure it's not the motherboard...
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September 5, 2010 6:53:03 AM

luigi_90 said:
if it is any help, there is someone with the exact same problem
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
it's a one-egg review, it has a video and everything
he says its something related with the voltages on the PSU, and I hope so...


I have the same problem. Did a new PSU solve it for you? Thanks
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September 7, 2010 12:36:38 AM

ktkcad said:
I have the same problem. Did a new PSU solve it for you? Thanks


well yes, I got a corsair CMPSU-650TX, and it's working fine
but I don't know what was the problem, the Antec PSU is working PERFECT in my old computer.
As I said before this is the first time I see this, I don't know if it's a compatibility issue, or something else

so yes, new PSU fixed the problem!
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!