PC Won't Power Up After Rebuild

B1ng · 9 Oct 2011 at 12:10

Hi all,
Just put my machine back together after carrying out some mods to my case, and my machine will no longer power up. The PSU and CPU fans spin for roughly a second and then nothing. This only happens once, and I have to switch the PSU off and on, then the same again.

Have pulled both GFX cards, tried both single sticks of RAM, now just have the Motherboard, CPU and RAM, with the 24 and 8 pin Mobo connectors in place, everything else is disconnected. Help!?

All thoughts and suggestions much appreciated.

saintdefender · 9 Oct 2011 at 12:20

Have you checked you have the cables plugged in properly in the PSU? Fell victim to that a few times!

Hyburnate · 9 Oct 2011 at 12:57

Dare I say it, could need to clear cmos.
Try out the case, could be being shorted.

stulid · 9 Oct 2011 at 13:47

If the clearCMOS dont work, try removing the RAM, powering up, shutting down, then fitting a single RAM stick in the furthest slot away and then move it closer to the CPU one slot at a time. Powering up in between.

B1ng · 9 Oct 2011 at 16:04

Checked all the wires on the PSU, tried it out the case. No joy.
Still the same without any RAM fitted too.

stulid · 9 Oct 2011 at 16:06

Well obviously it wont do a thing without RAM fitted, read the post again.

Power up without RAM, then fit a stick to the furthest slot away and power up, if no joy move it increasingly closer to the CPU.

B1ng · 9 Oct 2011 at 16:43

Sorry, did do that with the RAM as you said, my response doesn't make sense that way!

I should probably mention that i've braided all the single wires on my PSU. I've checked the pin outs and they seem ok, can someone please link a pin out diagram for the 24 pin and 8 pin ATX connectors to check it against (one that is definitely correct!)?

B1ng · 10 Oct 2011 at 07:14

Re-checked the pin outs and they would appear to be correct. Going to check them against another PSU tonight. If still no joy, which bit will be broke?

G-Dubs · 23 Oct 2011 at 15:32

Daft suggestions but is it worth checking the power and reset switches aren't sticking. One of the things I found was that when painted they became quite tight in their holes and were prone to sticking even though they appeared fine.

if it's not that then my guess would be a loose wire somewhere amongst all those you've braided. Not what you want to hear I know, seems quite likely.

ian54 · 23 Oct 2011 at 16:16

B1ng said:
This only happens once, and I have to switch the PSU off and on, then the same again.

Sounds like a bad PSU, I had the same symptoms. If you hold the power button for 4+ seconds will that "reset" it, i.e. as if the PSU was turned off and on ?