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Rebuilt gaming PC wont start up

Last response: in Systems
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July 28, 2012 8:03:54 PM

Okay, so my friend has an HP computer. It was 6gb RAM, a quad fore 2.6GHZ or something processor. 640gb HD, and a crappy video card. So i told him to upgrade his GFX card, his PSU to power it, and his case for more airflow and for it to stay cooler..

Well i have everything plugged, and it wont turn on. If hit button, ive flipped the switch in the back. And i think everything is plugged in.


Here is the specs now..
Mobo - HP M2N78-LA (Violet)
Case - Rosewill Gaming
PSU - Corsair GS600
GFX - XFX DD Radeon 6870
HDD - Western Digital 640gb

Ive tried booting it up without the RAM and GFX card.. didnt work.
There was one point in time where i unplugged and plugged back in the big 12vATX cord slowly, and i seen the Power supply flick on and then right back off?

Why wont it start up?
July 28, 2012 9:56:37 PM

Maybe a faulty PSU? have you maybe tried using the PSU he has in your PC to check if that is the problem
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July 28, 2012 9:59:14 PM

Tam93 said:
Maybe a faulty PSU? have you maybe tried using the PSU he has in your PC to check if that is the problem



I have been using the PSU in my gaming PC for about 6 or so months now. Its Corsair. It works beautifully.

That cannot be it.
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July 28, 2012 11:35:48 PM

Do you the mobo sitting on the standoffs correctly? The board good be shorting out
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July 28, 2012 11:36:38 PM

Also, do you have the 6/8pin and 24 pin connected to the mobo?
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July 28, 2012 11:39:00 PM

Try shorting the pins and see if it turns on. If it does that way, it is the PSU.
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July 29, 2012 12:49:46 AM

Yes i had the big 24pin plugged in all the way. and i had the 4pin flugged in the mobo to if thats what you mean by the 6/8pin.

And Azeem, what do you mean "short the pins?"
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July 29, 2012 12:49:57 AM

avenseth12 said:
Do you the mobo sitting on the standoffs correctly? The board good be shorting out


Also what do you mean on the standoff correctly? I know the board is having to sit in a different position in this case, but that shouldnt make a problem should it?
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July 29, 2012 1:09:24 AM

If you do not have the mobo sitting correctly on the standoffs they could short the board. The standoffs need to be in the right place based on your board config
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July 29, 2012 1:23:09 AM

avenseth12 said:
If you do not have the mobo sitting correctly on the standoffs they could short the board. The standoffs need to be in the right place based on your board config


How can i know this? This board was like one of the old fashioned ones where its upside down and the PSU is at the top of the tower instead of the bottom. The new case is this - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

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July 29, 2012 1:24:11 AM

Now i got to the point where the power button works, but i can sit and hit it over and over and once in awhile the computer will power on for like 1/2 a second then go right back off?
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July 29, 2012 1:25:31 AM

Could it possible be the bios/cmos or whatever its called? On this board you have to move little blue caps on the board for the Cmos/bios or whatever to change or reset.
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July 29, 2012 1:26:17 AM

Can you take a some pics of your setup and post them so we can see what it looks like
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July 29, 2012 1:31:55 AM

I plugged the old PSU thats only 300 watt in, and the light on it would turn green. then once i hit the power button it would turn off?

Leme take some pics real quick
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July 29, 2012 1:50:29 AM












This is after the new PSU and GFX card being hooked up in the new case.
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July 29, 2012 2:56:10 AM

ive done just about everything on that link possible. I dont understand.. everyone other PC ive hooked up from scatch worked fine? Could the mobo be dead? or what? or is the mobo too old and outdated for this newer stuff?
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July 29, 2012 2:58:28 AM

If no luck after that guide you may have fried the mobo on accident. The mobo and cpu were part of the original build right?
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July 29, 2012 3:01:55 AM

Did you try this to see if you get a boot? To eliminate the possiblility of a bad installation where something is shorting and shutting down the PSU, you will need to pull the motherboard out of the case and reassemble the components on an insulated surface. This is called "breadboarding
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July 29, 2012 3:32:09 AM

Yes we "breadboarded" it with the original PSU. It worked.

We breadboarded it with the new PSU.. it worked.

The 4/8 Pin Connector to the motherboard was plugged in backwards so it wasnt snapping in right. >.< hours on end and stress, just cuz of that. I feel stupid lol.
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July 29, 2012 4:22:03 AM

Okay nevermind.. i put it all back together with Corsair PSU, and it started up for about 10 seconds, then died. it did this like 10 times.. then it wouldnt start at all anymore.. i dont get it.... it is frustrating me.
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July 29, 2012 4:44:04 AM

Okay, so you found out it worked while breadboarding. Double check when you put the setup in your case that you have the standoffs right.

Did you install the standoffs under the motherboard? Did you place them so they all align with the screw holes in the motherboard, with no extra standoffs touching the board in the wrong place? A standoff installed in the wrong place can cause a short and prevent the system from booting.
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July 29, 2012 6:55:44 PM

avenseth12 said:
Okay, so you found out it worked while breadboarding. Double check when you put the setup in your case that you have the standoffs right.

Did you install the standoffs under the motherboard? Did you place them so they all align with the screw holes in the motherboard, with no extra standoffs touching the board in the wrong place? A standoff installed in the wrong place can cause a short and prevent the system from booting.


Wait.. the case came with standoffs? What exactly are standoffs?

All we did was set the motherboard in the case, align it with the holes, and screw it in?
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July 29, 2012 6:56:50 PM

Omg.. its probably those little gold things that came with the case isnt it?
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Best solution

July 29, 2012 7:07:27 PM

Yes if you do not have the mobo sitting correctly on the standoffs it will not work
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July 31, 2012 3:32:39 AM

omg it fixed it.. THANK YOU!!!
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July 31, 2012 3:33:10 AM

Best answer selected by ren3gade.
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July 31, 2012 5:06:02 PM

Good deal and glad to help
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