This happened a while ago and a new PSU fixed the problem, but just moved all my stuff to a new case and again the following happens
Plug power cord into the back of the PSU (tried 2 different ones so that doesnt seem to be the problem) and the CPU/Case/Gfx all start up, but nothing appears on screen.
I have took everything back out, tried it without DVD drives/HDD drives etc, totally barebones.
I have an idea it may be the motherboard shorting out or something - so I took the motherboard out, (ASRock coredual) checked all the case/motherboard risers (forgot name something) as some were loose, spinning when i screwed the screws in out.
Stuck.. to be honest, really thought the last bit would fix it.

Plug power cord into the back of the PSU (tried 2 different ones so that doesnt seem to be the problem) and the CPU/Case/Gfx all start up, but nothing appears on screen.
I have took everything back out, tried it without DVD drives/HDD drives etc, totally barebones.
I have an idea it may be the motherboard shorting out or something - so I took the motherboard out, (ASRock coredual) checked all the case/motherboard risers (forgot name something) as some were loose, spinning when i screwed the screws in out.
Stuck.. to be honest, really thought the last bit would fix it.