Hi all My main pc has gone down & i need some help figuring out what's broke. my pc was on & running fine,i turned on my audio (Logitech Z5500 Speakers 5.1 Surround Sound 505W RMS) at the control box,there was a loud humming noise & i realized the volume was up full from the night before when i had my headphones plugged in,then the pc just lost power & turned off. Now when i start it up the power supply comes on for maybe 2 seconds then turns off again then back on but the pc wont start up all the lights are on but nothing comes on the monitor. The psu is a ocz gamexstream 600w. Looks to me like its the psu thats gone but i ain't sure...so before i go ordering a new psu could it be anything else? or is there fuses in the psu i could just replace? Thanks.