G5 crashes after installation of Crucial RAM

I recently upgraded my RAM from its original 512 MB to 2G with modules from Crucial. The first pair I received did not work when installed together although they appeared to work individually in each slot separately. I sent them back to Crucial and they sent me another "build." Installed the second pair and the computer worked fine for 10 days. Now the fan surges, applications and the system crash continually making the machine very frustrating to work with. Genius at the Apple store said it's one of the following: bad RAM, failing HD or failing motherboard (I did not take the machine in to the store for examination). I've run the disk utilities from the start up disk successfully and repaired minor issues on the HD. Are my next steps to go back and test each memory module in each slot, one by one, to see what happens? If it's a problem with the RAM, why did it work fine for 10 days and then start causing problems? I hate to revert to 512 MB RAM but the crashing 2 GB is making me nuts! Are there any better suppliers of RAM than Crucial? Any insight would be appreciated.

I finally gave up on the Crucial RAM and put the original equipment 512 MG module back in. Now that doesn't work in either slot. The machine will not even start up with the 512 MG RAM in. I took the 512 MG out, put one Crucial 1 GB module back in. Sometimes the machine starts up, sometimes it doesn't. If it does start, it's incredibly unstable and will crash retrieving mail in Mail or starting up Firefox.
What has happened to my G5 now? Why will it not run with its original chip? Have I somehow damaged the RAM slots by putting in/taking out RAM? (I've been so careful.) I've been without my computer now for over a week and have no other ideas how to troubleshoot. Do I have to spend many $$ at the Apple store to fix this 6 year old machine? Any suggestions would be appreciated. I've used Apple computers for 20 years and have never been afraid of my machine before. Now my hands are tied and I can't use it.

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