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Computer Turns on Then Immediately Turns Off - Page 2

post #11 of 24
Quote:
Originally Posted by jollyjamo View Post
no digital multimeter and don't really know how to use one but im sure they're simple enough... but based on the symptoms, if I go ahead and stick a brand new PSU in this bad boy what do you think the chances are of it fixing the problem? Is it really a toss up?
Due to the old PSU being ok quality, I doubt that it killed any other hardware. As long as it's not the motherboard, I believe that your chances are pretty good.

EDIT: Antec is claiming that the PSU you have has "Over Voltage Protection" so if that worked your other hardware should be ok.
Edited by AtomicFrost - 5/5/11 at 10:14pm
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post #12 of 24
Thread Starter 
Aight, thanks everybody, whenever I can get around to purchasing a new power supply (due to low funds at this moment) I'll post an update and let you guys know if it fixed it. (I personally think it will fingers crossed)
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post #13 of 24
Sounds like a mobo issue to me. When my buds psu went out a couple years ago, it wouldn't start up or anything... paper clip trick?

http://www.overclock.net/faqs/96712-...upply-psu.html
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post #14 of 24
According to the Newegg specs, the PSU has four separate 12V rails with each rail rated at 20A. If the full 20A was available on each rail, the PSU would be rated for at least 960W, which it isn't. Therefore, it's most likely that there are intermediate caps on the 12V rails (maybe 12V1+12V2 can't exceed 20A or 240W combined or something). We'd really need to know which rails your motherboard connectors and PCIe connectors are drawing from, but it sounds like your current configuration is trying to draw too much current from a small number of 12V rails, instead of having power consumption spread evenly over the four 12V rails.
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post #15 of 24
Thread Starter 
I don't speak spanish dkim, in english please!

So are you saying you think its mobo too?
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post #16 of 24
I don't have a lot of experience working with power supplies so I may be incorrect here. However, I have experienced something a lot like this myself. In my case though, it was the computer pulling too much power and tripping the PSU off. In this case it turned out that a component of the hard drive controller had failed and was apparently creating a dead short. I realized this when, on about the 10th try, it finally started and I got a perfect thin stream of grey smoke rising from the hard drive (which was sitting upside down out on the table still connected). It wasn't a case of the PSU causing the problem, the component on the hard drive failed and the fault it created finally cleared which allowed it to start.

This may very well be something else and you'll find that everything is still working if you try a new PSU. I'm just reading the thing about the lack of display after it finally started up and am suspicious about the video card.
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post #17 of 24
Thread Starter 
try unplugging some components and see if it fixes the problem?
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post #18 of 24
Thread Starter 
i unplugged the power from the video card (not the entire card itself)- that didn't fix it

unplugged the entire hard drive (that didn't fix it)
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post #19 of 24
Eh, I don't know if this is the same situation, I just mentioned it as another possibility to consider.

I don't see any connection to the hard drive in this case, it just happened to be the hard drive that failed in my situation. But if there are any components that seem suspicious, you can try disconnecting them to see if it boots without them. If you think it might be the video card you could try disconnecting the video card completely but this already sounds like something else (besides, if it was a short somewhere, it might have already stopped if you got it to start for more than a second).
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post #20 of 24
sounds like your bios crapped out. Either that or another motherboard related issue. Ive had this happen on a p55 board that i had. Try booting up with bare minimum hard ware. 1 stick of ram no hdd no dvd, 1 video card. see if it will post.

If none of that works, you could always go to a bestbuy and buy a psu and use that to eliminate your current psu, and when done return it for a full refund.

I do think its your motherboard. Does your motherboard have dual bios by chance?

do you have another video card you can try too? You want to remove and replace the vital parts one by one to eliminate them as being the problem. Of course this is only possible if you got spare known working parts laying around.

realistically, theres only a few things it could be. motherboard, video card, and psu. It could possibly be others, but those 3 are the most likely.
Edited by AliceInChains - 5/5/11 at 11:54pm
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