Imac 20" intel Leopard black screen, does not start up

Imac 20" intel Leopard black screen, does not start up,
yestarday i put my imac aluminium in sleep, when i wake up this morning the computer did not start up from sleep and also did not start up from the power button back, i try several times and nothing, i hear the sound of the start up but i remain with a black screen. What can be the cause? The video , maybe? I did not install any hardware lately on it.
note: i have a wireless keyboard & mouse
Message was edited by: mindsoul

Not running Leopard (Panther), but I have a similar problem on my 24" iMac. Computer was working fine last night (I shut it down) and when I went to boot up this morning the computer is stuck on a black screen.
The boot up sound is initiated but nothing after that. The power light stays at full brightness, if I touch the power button the light blinks and then after a while it goes out. A full reset does nothing. I've tried reseting my PRAM, which works because I hear the start up sound twice, but no change to the black screen.
I don't have access to another Mac, would inserting the Startup Disc I received with the computer do anything?

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