Imac intel core duo random shutdown

My iMac 2006 (late) intel core duo 2ghz shuts down regularly after brief periods of activity. As soon as I turn it on, the HD fan spins at around 5000rpm according to istat pro. All other fan speeds and temperatures are normal.I need to unplug it for at least an hour in order to successfully boot up again, an then the same thing happens over again. A new HD was recently installed with the Mac OS extended (journaled) scheme on , and someone mentioned it should have been as GUID scheme. Can that be a possible culprit ? I dusted it all out, changed the ram for new and even changed the power cord.

it should have been as GUID scheme
Yes - any Intel Mac needs to be GUID partition scheme in order to be bootable. So, if yours boots up without a problem, then it should be ok. Check Disk Utility (Applications > Utilities).
What OS version are you running? I'd suggest booting from your disks (not knowing which version I can't be specific - but one should have AHT (Apple Hardware Test) included. See these instructions on how to run it (use the extended test) and post any messages or results you get:

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