Replacing Power Supply for 20" iMac w/o the Ambient Light

I am pretty sure my power supply is dead for the second time. I've taken the back off and done the power button/reset smu test to see if led #2 momentarily blinks, etc. Taking it to the genius bar is a while to see what they say, even though out of warranty.
Anyway, depending on what Apple says at the store about the cost to replace, I may do it myself. It looks like I need part #661-3350 but I am not sure whether it is considered non-PCF or PFC. Does it matter which one I replace it with?
Thanks.

Hello Twingirlz,
I just removed my power supply and received good guidance from JimWarholic.com. who referred me to this Apple article on PSU replacement:
http://manuals.info.apple.com/en/imacg517inch_PowerSupply.pdf
Here is a suggested source for the 661-3350 power supply:
http://www.dvwarehouse.com/index.php?mainpage=advanced_search_result&search_indescription=1&keyword=661-3350
My G5 1.8 iMac (1st gen)lost it's first power supply at fourteen months. The replacement burnt out recently due to (at least) swollen (defective) capacitors.
So it's somewhat uncertain if your replacement unit will again give up the ghost prematurely. The power supplies I've researched only have a three month guarantee. You can change the PSU without any trouble. But while you have the back cover off, look carefully at the Logic board to check for abnormalities (as in swollen or leaking capacitors (of which there are 25 in plain sight):
http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php
Alex G

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