Screen turned black and makes some sort of an alarm sound

Does anyone knows a solutions for this: my intel iMac was on all afternoon till suddenly the screen turns black and it starts making some sort of an alarm sound "tuut tuuut". I tried restarting but nothing changes. I tried restarting from the installation Disc with C-key but no result. As a matter of fact i can't even get the disc out of my iMac anymore. Thanx

That sounds like hardware problems, I suggest you call your local Apple Store to my an appointment for them to check it out for you.

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