IMac Display not turning on after sleeping for a while

Hey Guys,
Minor issue I've had with my iMac for the last few days, when I wake up I tend to nudge the mouse to turn on the display before taking a shower so that everything is ready for when I get back. However the screen isnt coming on and I'm having to press the power button to sleep the iMac then wake it up again by pressing the power button 5 seconds later, after that, all is good.
Any ideas? This has been since upgrading to 10.6.4
Thanks

Yeah I might think it's overheating too, but the harddrive always makes this strange noise before the crash happens, so it could be related to the hdd? Or in the worst case, the motherboard.
Any tips on how to check for overheating? I have tried to run temperature monitor software, but the only sensor it detects is the hdd, and it looks fine.
I haven't opened my iMac fully ever, just the user serviceable parts. I installed an Airport card about 1 month before this started happening, could this be related?
Pierre, what did you do when your iMac started overheating? How did you fix it? Mine just full crashes and the screen goes weird. Thanks for your answer.

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the first thing to try is resetting the pram/nvram
http://support.apple.com/kb/ht1379
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3/10/11 7:33:53 AM kernel ring head = 0x000013b0, wrap count = 0x 0
3/10/11 7:33:53 AM kernel ring tail = 0x00001f58 ring control = 0x00003401 enabled, auto report disabled, not waiting, semaphore is waiting, length = 0x004 4KB pages
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Any tips on how to check for overheating? I have tried to run temperature monitor software, but the only sensor it detects is the hdd, and it looks fine.
I haven't opened my iMac fully ever, just the user serviceable parts. I installed an Airport card about 1 month before this started happening, could this be related?
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IMac Display not turning on after sleeping for a while

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