Black screen after power on and startup sounds repeats

Hi,
yesterday evening during a WOW session the screen went gray and the iMac did not respond to anything. I pressed the power button and started again. I got a black screen and the startup sound repeated endlessly.
This morning the same. I checked the RAM modules in my macbook; they are ok.
It is an early 2008 iMac 2.8 with NVIDIA graphic. Resetting PRAM or NVRAM does not work. Screen always stays black and the startup sounds repeats itself after pressing the power button.
Any ideas?
Thanks

Try using this procedure to reset the SMC (power management)
http://support.apple.com/kb/HT1543
If that does not work, insert your Mac OS X installation disc and start up (or restart) with the C key held down. Does it start up properly from optical drive?

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