Help PC wont Boot

Jedipottsy · 15 Mar 2011 at 19:35

Hi,
This is my machine

Q9550
Asus P5Q-E mobo
8GB DDR2 Ram OCZ Platinium
Gigabyte GTX460 SOC
650w Truepower PSU
2xWD 640gb Drives
1xsamsung 320gb Drive
1xoptical Drive
5 Case fans

my case was making some noise, like a lead was rattling on a fan. I opened the case and couldnt find the cause, but thought it best to move the remaining cables to the back of the case. When i put the computer back together and turned it on, the PC wont boot. The monitor wont turn on, unplugging all of the drives lets the monitor turn on, but it stays at black. I assumed it was a GPU issue, so i replaced the GTX460 with an 8600GT, which uses a single 6pin PCI-E power lead, and it still wont boot. The computer makes all the normal startup sounds, and it seems like it has started but nothing happens. Any idea what could be wrong with it?

Thanks massively for your help.

EDIT: Also tried a different PCI-E slot, removed all but 1 stick of ram, disconnected everything none essential and reset BIOS, still nothing shows up.

TWiNKLeT0Es · 15 Mar 2011 at 20:10

Did you check the cable connection on the monitor side is secure?

It may have come lose after moving it around?

Did you resolve the rattle?

Jedipottsy · 15 Mar 2011 at 20:14

TWiNKLeT0Es said:
Did you check the cable connection on the monitor side is secure?

It may have come lose after moving it around?

Did you resolve the rattle?

Yeah theres no rattle any more, tried multiple monitors via DVI and RGB, no luck

Jedipottsy · 15 Mar 2011 at 20:29

im assuming either PSU or Motherboard, i think the GPU is fine, the back board lights are all green, and another working card does the same. How can i tell which?

TWiNKLeT0Es · 15 Mar 2011 at 20:32

Jedipottsy said:
Yeah theres no rattle any more

Typical.

Did you supply the CPU with the power connector after putting it back together?

Do you have another PSU to test with?

Have you checked for any damaged cables from the rattling?

I would run just the essentials from outside the case to rule out any shorting.

Jedipottsy · 15 Mar 2011 at 20:37

TWiNKLeT0Es said:
Typical.

Did you supply the CPU with the power connector after putting it back together?

Do you have another PSU to test with?

Have you checked for any damaged cables from the rattling?

I would run just the essentials from outside the case to rule out any shorting.

Yup, plugged in the 24pin and 8pin first, put the power supply lead in switched off then turned it on at both the wall and psu switch. I do have another PSU but not at hand, ill get it tomorrow, cables all seem fine, no damage. Still no idea where the rattling was coming from. Ive taken everything out except PSU, cpu, mobo, 1 ram stick, 1 HDD, 1 optical, only plugged in DVI, mouse and Keyboard, still nothing. Even tried the lower power 8600GT in the 2 other PCI-E slots.

TWiNKLeT0Es · 15 Mar 2011 at 20:42

Try leaving the PSU switched on at the wall for few mins before powering on.