HELP !  iMac G5 won't start up!!!  HELP!

I have a iMac G5 OSX 10.4.6 I recently bought an 320gb western digital external hard drive. I wanted to back up my iMac hard drive, so I installed superdrive software. I backed up my computer with no problem. I shut my computer down and left for work. When I returned a few hours later, my computer will not boot up. I've tried unpluging all the power cords, including the one from the wall. No start up. I unpluged again and this time I press apple key contol key and P and R keys. Sttill nothing. My computer is making a funny noice when I try to power up. It's like it struggling to power up, a tick noise. Is there any advice anyone can give me?

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