I hit the button to turn it on, the monitor was still off, I usualy leave it off untill I knwo it would have finshed starting and continued doing my schoolwork. I heard all the drives start then the normal "beep" and with in secondsof the beep it just stoped! silence again it had shutdown yet the numlock key was still iluminated. no restart, it wouldn't start up again. I switched it off at the wall and the numlock key still stayed on for like 20seconds.
I'v been trying heaps to start it but nothing. Iv made sure the plug is all conected and when I switch on or off the outlet at the wall I hear the little hisses comeing from inside the computer. So the power flowing into it it just wont start!
I had had my computer running about an hour erlier this morning and it shut down with out any troubles.
OOOO please help me
I just can't get a new pc now, its not possible!!! James
I think im cursed. 

So hopefully its a hardware issue and not involving one of the many things iv added into my pc since purchase!

lol argh!
Just like what happend on my old PSU and they one they replaced it with (the one I had taken out cos of the noises) and now its doing it again. Even for opening firefox I hear the hiss