System half powers on....strange things.

[Gonzo0]

So there I was happily listening to my music when all of a sudden the whole computer shut down. It then powered back on but with no display and no fans on the mobo/case/cpu and gfx card spinning up.

The hard drives spool up and the fan on the power supply spins. The lights on the mobo also light up but again no display.

Any suggestions before I start swapping parts?

Thanks

 

[Gonzo0]

System specs:

Biostar T-power x58 Intel mobo
Intel i7 920
OCZ reaper 6gb ram
Corsair hx 750w modular PSU
Gigabyte 570gtx gfx card

Setup is 5 years old with no overclocks applied.

CMOS reset hasn't worked