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Old 01-21-2008, 01:52 PM   #11 (permalink)
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Default Re: New build won't turn on - any ideas why?

to me, that seems to be 1 and 2 of what I previously said...tellin ya man!

may be more cpu mounting that mobo mounting.
you are using paste on the hsf to the cpu?
recheck the mobo mounts
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Old 01-22-2008, 11:23 AM   #12 (permalink)
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Default Re: New build won't turn on - any ideas why?

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Originally Posted by atomic tofu View Post
to me, that seems to be 1 and 2 of what I previously said...tellin ya man!

may be more cpu mounting that mobo mounting.
you are using paste on the hsf to the cpu?
recheck the mobo mounts
The mounting all seems fine to me, everything went together perfectly well.

I'm using a 250V ac input into the PSU, which says it requires 230V. Would this make any difference?
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Old 01-22-2008, 02:27 PM   #13 (permalink)
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Default Re: New build won't turn on - any ideas why?

I had the same problem a few weeks ago. I checked out the PSU and it seemed faulty wouldn't power a single fan well it would for a second so i sent the PSU back and its due back this week so i hope it was that now after reading this thread. Did ye try just connecting a fan to the PSU ? Does it power that ?
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Old 01-22-2008, 03:34 PM   #14 (permalink)
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Default Re: New build won't turn on - any ideas why?

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Originally Posted by jaybe1 View Post
I had the same problem a few weeks ago. I checked out the PSU and it seemed faulty wouldn't power a single fan well it would for a second so i sent the PSU back and its due back this week so i hope it was that now after reading this thread. Did ye try just connecting a fan to the PSU ? Does it power that ?
I'm also inclined to think that it's the PSU, as it doesn't power anything that's connected to it.

However I tried a different PSU that works on another PC and that didn't help.
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Old 01-24-2008, 01:29 PM   #15 (permalink)
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Default Re: New build won't turn on - any ideas why?

Any joy ??? Did ye try a single fan on the PSU and disconnect everything else from the PSU also did you try connecting the other PSU to a single fan. Maybe the other one isnt powerful enough to run the new pc !!!
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Old 01-24-2008, 01:34 PM   #16 (permalink)
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Default Re: New build won't turn on - any ideas why?

Wait are you saying that when you push the power button, the fans come on for about a second and then nothing happens?

Same thing happened to me. I had shorted out the cpu, gpu, and mobo.
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Old 01-24-2008, 02:27 PM   #17 (permalink)
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Default Re: New build won't turn on - any ideas why?

How did you short them out ??? And how can you tell if there shorted out ?
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Old 01-24-2008, 03:15 PM   #18 (permalink)
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Default Re: New build won't turn on - any ideas why?

The fan and led don't seem to come on at all now, I'm worried that I've screwed it all up.

If I've shorted it all out, how would this have happened, and can I resolve the issue?
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Old 01-24-2008, 03:17 PM   #19 (permalink)
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Default Re: New build won't turn on - any ideas why?

Sorry I would have been more descriptive above but I was in class while I typed that and the bell rang so I didn't have enough time.

Anyway, I had taken apart my comp to replace an old IDE cable with a newer rounded one, and to apply MX-2 thermal paste to my proc which previously had AS5. Anyway it turns out that somehow during that process one of the wires that plug into the HD Audio connector came loose and I guess it must have made contact with the mobo because all my major hardware was shorted out...

At first I didn't know I had shorted it and I just kept pushing the power button in frustration, and each time the fans spun up and my cathode turned on for about 1 second then everything shut down. Then I discovered that by pushing the power button again and again really fast I could "trick it" into staying on, but it still wouldn't even POST let alone boot up. So then I thought the PSU was bad and I almost sent it out for RMA, but I tested it with the pin test and it worked. (If you don't know, the pin test is when you use something metal like a paper clip or a pin to connect the green and black wires on the 24 pin mobo power cable, which should trick the PSU into turning on even though it isn't hooked up to the mobo or anything. If it works, then it's not a bad PSU from my understanding.)

So then I figured it must be my other hardware that was ****ed up so I took out everything except the mobo, RAM, CPU, and GPU and tried to turn it on, same thing. Then I tried it without the GPU, only mobo, RAM, and CPU, still same thing. Finally after removing the CPU it did turn on but it still wouldn't POST (obviously) and there wasn't an image on the screen when I tried it with 2 different graphics cards.

So then I knew my CPU must have been shorted out. I wasn't sure about the mobo or GPU yet though. So I took my GTX over my friend's house and tried it in his PC... it didn't work. So then I knew my GTX and CPU have both been fried. Just to be on the safe side, I also RMA'd the mobo. Assuming all were fried, that's about 800.00 in damages all because of one stupid wire. Luckily everything was still under warranty.


Since you said that when you try to turn yours on, nothing happens except the fans spin up for a second and then it shuts down, I'm thinking maybe one or more of your parts have been fried or were dead on arrival (DOA). So I recommend using the pin test to test your PSU if you haven't already, and if it works with the pin test then you'll know it's not bad. Next try to boot it up with minimal hardware... just mobo, CPU, and RAM, but connect a fan too so you know if it stays on then the fan won't stop spinning. Each time it doesn't work remove another part, until it does work. You could also try out your graphics card in a friend's PC like I did just so you know if that's working at all. Same with RAM, HDD's, etc.

Another thing, take out the CPU and inspect all the pins very closely. On mine, two were discolored as compared to the rest of them, leading me to think it was shorted out. Also inspect your mobo for signs of a short.

Good luck.
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Old 01-24-2008, 03:31 PM   #20 (permalink)
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Default Re: New build won't turn on - any ideas why?

Thanks for the very helpful post, this certainly sounds like the problem. I'll look into the things you mentioned.

When the PSU is connected to just a fan nothing happens, is it supposed to? I figured the PSU wouldn't actually power the fans etc unless connected to the motherboard.

edit - I've inspected the CPU and one of the pins looks very slightly darker which may be what you mentioned. Would it be safe to try this on another PC, or would this risk blowing that things mobo as well?
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