New ram - computer does not start up

Hi all,
I have a first gen iMac G5 (1.8 Ghz, 250 GB Hard drive, 1 G Ram). This RAM was installed:
DIMM0/J4000:
Size: 1 GB
Type: DDR SDRAM
Speed: PC2700U-25330
Status: OK
I wanted to upgrade to 2 GB, so I checked around, everywhere it says I should have PC3200 RAM sticks, even on the Apple website. Same at the store (a kind of mall specializing in Apple stuff), they sold me 2 GB of DDR SDRAM PC3200. When I installed them, the computer would start up but get stuck on the little gear wheel, until the screen went gray and a message appeared in 4 languages saying that I have to restart the computer.
So then I put the old RAM stick back in, but same thing happens - computer would start up, get stuck on the little gear wheel, until the screen went gray and a message appeared in 4 languages saying that I have to restart the computer.
Any ideas what I could do? Or did I kill the computer for good?
Any help is much appreciated.

Hi again,
so, after a bit of struggle (mainly with the hard drive casing), I managed to switch out the hard drive for a new one and installed the new ram. Everything seems to work fine so far. Only difference so far is that the fans don't seem to come nearly as much as before. Things seem warm, but not worrisome hot, so I wanted to check if these temps are ok or if I need to be concerned:
HD 52C/126F
CPU 65C/153F
Hard Drive 49C/121F
Both Disk Utility and Disk Warrior report no problems.
If these temps are too high, how can I rev up the fans a bit?
Thanks for the help!

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Patrick,
What BIOS level are you running on your PC? What model NVIDIA video card are you using? If it's the 220 then try this HP NVIDIA video card update.
Try this procedure:
Unplug the PC and open it up.Clean out all the dust. Carefully remove and replace all the cables going to the motherboard one at a time. Do the same for the memory dimms and the video and sound cards if you have any. Plug your PC back in a give it a go.
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New ram - computer does not start up

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