Why won't my iMac G5 let me install Leopard OSX?

I am desperately trying to install Leopard OS X. It will not let me install and I brought the whole computer to the genius bar and they told me to install more RAM which I proudly did myself. It is still not working. When I put the CD in it lets me click on install then restart. But when the computer restarts all that happens is a gray screen with apple logo and timeclock. The fan races loudly and eventually I just have to shut it down and restart holding the mouse just to get the CD out. HELP PLEASE. I am SO frustrated.
Terry

First of all, does the new RAM you installed show up in your System Profiler? Are you using a retail copy of Leopard (the one with the starry sky and the big X on it)?
Let us know the answers to the questions and we can take it from there,

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