System won't boot, have tried everything

[Fyrene]

Okay, I've looked at a lot of threads and tried everything I can but my computer still won't boot.

My system specs are

GPU: Nvidia GTX 960
RAM: Corsair 2x4gb DDR3
CPU: AMD FX6300
PSU: EVGA 600W
Motherboard: Gigabyte SKT-AM3 Micro ATX

Okay, so about a month ago my PC just died. Everything would start no problems, fans on everything ran but my PC didn't boot up. Monitor didn't display anything either.

Since then I have replaced my CPU, my Motherboard, my PSU and my RAM. I have double, triple checked that my ATX12 and ATX24 pin connectors are both in. My GPU is plugged in and I have tried using integrated graphics too, no luck. GPU was also new in November. I have drained my PC of all power multiple times by holding the power button without the PSU plugged in.

The CPU is also definitely the correct way around and I have double checked that the GPU is plugged properly in. The only slot I can see that isn't plugged in is the IDE but that isn't needed IIRC.
I have also tried putting only 1 RAM card in each slot. Again no luck.

Any peripherals I plug into the motherboard don't seem to work either, ie they do not light / power up when plugged in.

If you need any more information I'd be happy to provide it.

 

[thejackal85]

What type of HDD do you have? How is it powered (i.e. directly to the wall, power strip, etc)? Have you tried removing any USB items you have and then booting up? Including keyboard, mouse, webcam, etc.

 

[Fyrene]

I've got an internal HDD that's powered through the PSU and no USB etc connected to the motherboard