[Daniablo]

I bought the parts for a new computer last week and put everything together correctly and it worked just fine for a week, today I was restarting my computer after a software install and it wouldn't turn on.

Nothing has been changed or opened since I put it together, the motherboard shows the green LED for power but won't switch on.
If I unplug the 8pin(4+4) connector it will power up ( fan start spinning) but won't POST which is expected, but when the 8 pin (4+4) is plugged in nothing happens. So I suspect the problem to be with the PSU cables or motherboard's port, the PSU comes with two sets of 4+4 cables and both have the same result.

My motherboard is an ASUS P8P67 PRO and my PSU is a 1000W CoolMaster Silent Pro Gold.

Thanks in advance and sorry if this is in the wrong forum.

 

[Tyree]

Brand & Model of CPU-RAM-Graphics?
Your problem sounds like a PSU but it's a possibility you have a short. Did you use one standoff, no more no less, for each mounting hole in the Mobo?
What was the software you installed before the problem occurred?

 

[Daniablo]

CPU: i7 2600k
RAM: Corsair Dominator 2x 4GB DDR3 1666MHz
GPU: GTX 460

Yes the motherboard is mounted correctly all 9 standoffs are in place and in use.

I was installing the motionjoy ps3 dualshock drivers.

I just can't understand how this could suddenly occur.

 

[Tyree]

I would suggest a bench test.

Remove EVERYTHING from the case.
Set the motherboard on a non conductive surface. The motherboard box is perfect for this. DO NOT PLACE THE MOTHERBOARD ON THE STATIC BAG! It can actually conduct electricity!
Install the CPU and heat sink.
Install 1 stick of RAM.
Install the video card and attach the power supply connection(s) to the card if your card needs it.
Connect the monitor to the video card.
Connect the power supply to the motherboard with both the 24pin main ATX Power connection and the separate 4 or 8 pin power connection.
Connect power to the power supply.
Do NOT connect ANYTHING else. Make sure you have the power connector on the CPU fan connected.
Use a small screwdriver to momentarily short the power switch connector on the motherboard. Consult your motherboard manual to find which two pins connect to your case's power switch. Then touch both pins with a screwdriver to complete the circuit and boot the system.

If all is well, it should power up and you should get a display. Then assemble the parts into the case and try again. If the system now fails to boot, you have a short in the case and need to recheck your motherboard standoffs.

If the system does not boot after this process, then you most likely have a faulty component. You'll need to swap parts, start with the power supply, until you determine what is defective.