Strange issue with RAM upgrade: It works but it doesn't! Please help.

Hello Everyone,
I have a very strange issue with my iMac since upgrading my RAM from 4 to 12 gig. When I first installed the new RAM it booted up and ran great. The next time I went to boot the iMac up it swtiched on but didn't get as far as the first white boot up screen. I tried turning it off and on a few times using the power on/off button but still no success. I decided to remove the RAM and reseat it. The computer then booted up again fine. Here's the problem though: when I went to switch my iMac on the next day it wouldn't boot up. Again, I took the RAM out and put it back in and the iMac booted up fine. I've checked the status of the RAM in the system profiler and it reports that everything is OK. So, I'm at a loss. Obviously, I don't want to go through this process every time I want to start up my Mac. Any ideas/solutions would be very gratefully received.
Many thanks in advance.

I completely agree with you. It will be one of the 3 issues you outline. The machine was bought brand new and has never given me a problem. It is just the introduction of the new RAM that has started a problem. However, I did just risk a restart and it booted up fine. I don't know if a restart is any different to shutting down and then pressing the on/off button to start the computer. Maybe my last reseating has done the trick or maybe my thinking is flawed because restarting involves a different process to booting up by pressing the on/off button. I don't know.
In the part of the world I'm sitting in it's night time now so I will leave the diagnostics running and check the results in the morning. I hope the issue is now resolved anyway. This sort of thing takes me back to my dark PC days although in this case I know it's probably not the Mac's fault.
Thanks again. Very much appreciated.

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