Imac wont wake up from sleep, runs hot in games

I have a brand new Imac and when i put in sleep mode i can click the mouse and hit the keys all i want it just wont come back on .. i have to totally reboot my Imac. also i have the best Graphics card available right now from apple and when i play Command and Conquer it gets Extremely hot to the touch?
Any thoughts or suggestions?
Thanks

You have a lovely intel machine, you lucky thing. However, this forum is for PPC G5 iMacs, you need to post on the [intel iMac forum|http://discussions.apple.com/forum.jspa?forumID=1110].
Hope you find a solution,

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