I have a iMac that wont start up after it sits for a short time

I have a iMac that wont start up after it sits for a short time. I changed out the hard drive and reinstalled Leopard. If I mess with it a little I can get it to start up usually by repairing the hard drive with another computer, one time I just held down the P-R-option and command keys and it worked. Once its on it will restart no problem but if it sits for and hour or so it will get stuck either in the grey screen or blue screen. I also pushed the smu button but didnt work. Please help? Thank you.

For this type of question, we need to know which iMac you have. This forum covers G3, G4, and G5 iMacs that have different hardware, and any recommendations are better handled if people know which you have. For starters, do "About this Mac" from your Apple menu and look at teh processor type.
You also need to tell us the version of the Mac OS you have, also avaiabe from "About this Mac.
If the processor type says "Intel," you have a newer iMac that this forum covers and should report in the area for current iMacs here:
iMac (Intel)

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