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My compuetr power's on for 3 seconds then turns off


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Tmoney900 Tmoney900 is offline
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30-Jun-2012, 03:24 PM #1
My compuetr power's on for 3 seconds then turns off
After that I cannot turn it on with the motherboard or the power. It happens every time I power on the psu. Does it with my old power supply as well. HELP!!!
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30-Jun-2012, 03:36 PM #2
Howdy,

How old was the PSU in the PC and how do you know the older one you tried is any good.
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30-Jun-2012, 03:38 PM #3
You need to provide more info.

Have you changed anything ie added a new video card, swapped mb, etc?
You list some very pw hungry hardware. What pw supply did you swap in to test?
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30-Jun-2012, 04:42 PM #4
I changed from a 750W to a 1000w psu and yes it happened with my old power supply this is something very recent.
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30-Jun-2012, 04:46 PM #5
Anything happened before this that might be related?

Have you removed any un needed devices.
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30-Jun-2012, 10:35 PM #6
Quote:
Originally Posted by Tmoney900 View Post
I changed from a 750W to a 1000w psu and yes it happened with my old power supply this is something very recent.
OK, as I understand the issue you had a problem and tried a different pw supply. Problem is still there; is that correct?

Have you tried with all drives disconnected, all usb devices disconnected and any add-in cards pulled [except the video card] If not, do so. If it posts like that, then start connecting devices one at a time until you find the failed part. If it does not post, then you will have to swap parts with known good units, ie ram, mb, cpu, etc.
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01-Jul-2012, 02:18 AM #7
I just went through and checked the system and now I'm getting it to start up but I might have found the problem. The D-Ram light went on which is odd b/c my RAM is compatible with my mobo, and now for some odd reason I'm getting no picture.
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01-Jul-2012, 02:19 AM #8
So ya it's probably not a psu problem.
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01-Jul-2012, 09:25 AM #9
You list 12gig of ram. Pull out ALL ram and pw ON. You should get a beep code [if you have a speaker connected]

Now shutdown and install just a single ram chip and pw ON. See if the board will complete post. If it does, then repeat with another ram chip. You may have a single ram chip that has failed or you may have a problem with the mb.
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01-Jul-2012, 02:41 PM #10
I'm getting no beep code from the speaker.
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01-Jul-2012, 03:05 PM #11
That's without the RAM.
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01-Jul-2012, 04:26 PM #12
If you do not get a beep code with all ram removed, that points at a failed board.
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