PC won't start

[strugglepoo]

When I go to press the on button, the PC seems to turn on fine, I just get nothing on the screen with the reset button ticking and flashing every second. Furthermore, I can hear a high pitch squeal from the power supply that I don't think I've noticed before. Prior to this problem, my PC would randomly reboot at times when it seemed a bit CPU intensive. Now my PC won't even start up at all.. no green light, fans don't turn on. Should I look into replacing the power supply?
Also, I just noticed the power supply fan wasn't working at the time.. but then again, I can't even remember if it was ever working in the 1+ year I've had it,

 

[CrazeD]

If the powersupply fan wasn't on, it very likely over-heated and fried. Time to buy a new one.

 

[strugglepoo]

I replaced the power supply and it works perfectly now. Something smells a bit off, though. Nothing seems to be overheating as far as I can tell. Maybe it's just the new power supply warming up?

 

[phucng_10]

PSU would sometimes be the problem to your components not working. Well the smell, I don't exactly know what that can be.