Intel Mac (Core Duo) Boot Problem

Just recently my Intel Mac started having power-on issues. When I power down and then try to power back up, it won't start. Sometimes I just have to let it set for hours and then try again. I also noticed that if I initiate a restart from the Apple menu it wont shutdown properly and never restarts so I have to manually shut it down by holding the power button in.
I thought it might have something to do with the quality of the power signal in my house, but my mac is attached to a fully-operational (battery in good condition) backups with line conditioning.
I'm concerned that something on the logic board might be overheating...could this cause the power-on issues I'm seeing.
Another symptom that I'm not sure is related is that upon launching photo booth, my camera never turns on and eventually I get an error that the camera is in use when it clearly isn't.
I'm going to do another system backup, but wondered if anyone has experienced these repeatable power on issues and if so what was the cause/solution.
Regards
JD

A few things come to mind at this point:
1. Is your Firmware the correct version for your model? Use the link below to check!
Mac OS X: Firmware Updates for Intel-based Macs
2. The Hardware Test on the Install disk 1
Intel-based Macs: Starting up into Apple Hardware Test
3. TechTool Deluxe if you have Apple Care?
Apple Care

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[email protected]

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