new pc built, wont power up

[SUBMAN1]

Originally Posted by Prof

I can't imagine your PSU drawing more than 5 Amps (not Watts!) from the mains unless it's broken. Still, it's worth trying a different fuse (or a different lead if you don't have a spare 5A fuse handy).

I've had a look at your system specs and you have built a high-end system powered by a very cheap PSU. Big mistake, if you ask me. A decent system will need a decent PSU to run properly. Although it might say 550W on the case, it might not be able to supply enough power on the 12V rail to power your GFX card.

Still, I would have thought it would at least turn on!

Nope, you will get 0 life if the PSU is not able to power the system. It will refuse to turn on at all.

By the way, my PSU has a 55 Amp inrush voltage, so I have popped 15 Amp circuit breakers on occasion for simply plugging my system into the wall! In my old place, I never dared unplug it since it was a pain to keep resetting the house circuit breakers until the inrush voltage was finished.

-S