Need to Replace Power Supply

I have a iMac G5 20" with the built-in iSight. My computer has progressed from having occasional issues to not being able to boot up at all.
It started w/the freezing and the fan kicking in...to grey screens of death...to kernel panics. I tried multiple times to use the disk utilities both from the install disk and from the applications - it found nothing wrong.
I wiped out the hard drive and reinstalled the OS...happiness was brief as it crashed within minutes of restart. Tried this multiple times - it wouldn't even make it through the install sometimes.
Took it to the Apple Store - Genius Bar - the only suggestion was to replace the hard drive. She gave me the cards of some outside techs stating that it would be cheaper since I'm out of warranty anyways.
I bought a new hard drive and with the help of my boyfriend (and a handy YouTube video) we replaced it ourselves. I got as far as again trying to install the OS and was not successful. It will only occasionally boot far enough to get to the disc utility. I was able to format the volume at least.
From what I've read the Power Supply is probably my next stop. I found the part I need (661-3780), but can't figure out WHERE it goes.
Can someone point me in the right direction? Help!!

Look at some of these:
http://www.kodawarisan.com/imacintel/imacintel01.html
http://xlr8yourmac.com/systems/imacisight_internals/imac_g5_isightinside.html
http://nl.youtube.com/watch?v=iVgL9u7ySUk
http://nl.youtube.com/watch?v=fI_QmBueWg4&feature=related
They should help you,

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