My iMac won t wake up after going to sleep

Ok, here s my problem. When the computer goes to sleep, later I press a key, the monitor stays black, the fans spin up a bit, and then I have to pull the power plug cause nothing can wake it up...
what to do?

I'd like to post a reply in this forum because I've had a similar issue and I'd like to see what could come of a little discussion. This iMac is 2 weeks old, I purchased a 1 GB RAM chip (from Omni Technologies through Ramseeker.com) to upgrade from 512 stock. The RAM installed with no problems and I have to say; this is the easiest upgrade I have ever made, Apple's design for opening the computer is truly supreme.
So I read about 128bit vs 64bit data paths and got greedy for power realizing that my RAM was not matched. So I contacted Omni and ordered 2 matched 1GB chips and planned to return the 1GB chip I had previously purchased. Again, the RAM installed with no problems, but this time my computer would not wake from sleep no matter what. Exactly as Tomi K. describes; blinking light goes off, fan spins up, but the screen stays blank. Hardware tests and applications work fine, but the computer will not wake from sleep. I have been all over these discussions, resetting, unplugging, and trying different combinations of RAM etc. The only thing that works is the original combination of 1.5GB of RAM, which completely solves the problem. I'm baffled and I am curious... could this sleep issue really be related to the RAM even though everything else works and tests fine? Should I try to get another kit of RAM and see if that works? Any feedback would be appreciated.

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