Computer won't boot.

[LiquidSwords]

I built a computer around Christmas of last year, it was working fine until a few days ago when it just shut off out of nowhere and wouldn't boot. Pressing the power button wouldn't do anything so I thought the PSU was dead. I bought a new PSU as I had planned on buying one soon anyways, I replace it and connected everything and it still won't work. I've tried completely taking the computer apart to running it with minimal things on it and it still won't work. Does anyone know what the problem could be?

 

[Outlander_04]

Got a speaker on the mb?

so you can hear the BIOS beep code?

If not then get one and your computer will probably tell you what is wrong