IMac (24", late 2006) does not start

Hi
I am no native english speaker so please excuse my english. ;-)
I have a problem with my good old iMac (24", Late 2006, Core2Duo). When I start it the screen stays black, and the standby LED is permanently on. The gray screen doesn't appear, but the computer seems to boot normaly (usual hard disk sounds).
When I start the iMac with long power button pressing, it starts, the standby LED flickers and I hear one long beep. Accouding to the Apple support information one long beep means "firmware restoration in progress". But we didn't start a firmware restoration and the last shutdown was a normal one, no hard power off or something similar.
I already did a PRAM/NVRAM reset and a SMC reset. But nothing changed...
Is there anybody who could please help me?
Kind regards
Dirk

Dirk,
Run Apple Hardware Test in extended mode 2-3 times at a miminum. If errors appear then you have confirmed a hardware fault and the machine needs to be repaired. However AHT isn't the most reliable test in finding errors, in other words if no errors appear then that doesn't mean the the hardware is OK, it just means no faults were found. My recommendation would be to take the machien to your local Apple Store or AASP to be thoroughly tested.
BTW, you could also restart in Safe Mode , this will clear some caches however I don't think this will help based on your desciption.

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