20" imac gets random black screen and wont wake up.

O.K. this imac randomly goes to a black screen while your using it. It looks like it's asleep accept the light in the front doesn't pulse and it wont wake up.
If I hit the power button to put it to sleep I can then wake it up.
I tried resetting the SMU but have had no luck (not sure if it's even resetting seeing the date and time are still good) not sure why seeing resetting the SMU is a very simple processes.
It's a 20" intel imac 2GHz duo with system 10.4.11 (early 2006)
I was going to reinstall 10.4.11 to see if that helps and wanted to see if anyone else knows what to do. Its very random and seems to be getting worse, sometimes as soon as I get it fixed it goes black again. It usually only takes 15-30min after start up and doesn't matter if your using it or not.

Hi all,
my first mac ever was also an Early 2006 20" iMac and it had the same symptons as yours late last year.
Tried all I could think of and then took it to an Apple Dealer here in Hamburg.
Turned it was the Power Supply Unit (both of them) and a repair (out of Applecare obviously) would have been in the range of about 500 Euros (material plus manhours).
So I decided to not get it repaired.
Regards
Stefan

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