Power Supply Makes A Buzzing Noise And Wont Turn On

I was watching a movie and paused it to go get something to eat. When i came back i pressed space (my media player uses space for pause/play) almost simultaneously as i pressed the spacebar the computer shutoff. I waited a few seconds and attempted to turn it back on, but no go. When i press the power button a short 1 second buzzing sound comes from the power supply and doesn't power on. The motherboard light does turn on, im not sure what the light is but it is always on as long as the computer is plugged into the wall. As far as build up problems and signs, my computer was/has been running fine for over 3 years now. My motherboard is actually fairly new, i sent back my old one for a replacement a little over 14 months ago. I haven't got the time to check the voltage coming from the psu, but can i really if it wont power on? Also, considering that the onboard light on the motherboard comes on can this be a indication of a bad motherboard? Or other faulty hardware? Or does this sound more like a psu problem? My computer has ran flawlessly with no crashes or lockups. Until now apparently. My specs are:
Motherboard: asus a5prd1-v
Memory - 1gb (single module) ddr
Hard drive: western digital 160gb sata
Cdrom: sony dvd-rw x16
Video: ati radeon x800xl
Power supply: 350w codegen

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Follow the link for details:-

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