IMac doesn't work

Two weeks ago, a message (with different languahes) pop-up to ask me to restart the computer when i was visiting my favorite websits, the content of the message is "you need to restart the computer, hold power the power button for several seconds or press the restart button", after that the message appeared several times again.
One week ago, when I pressed the power to start the iMac, I can only hear the voice of the fan, 3 beep sounds, the white light at the front panel is flashing, no screen.
I try to insert an installation disk into the CD slot, it doesn't response.
I am not sure this is a application problem or hardware problem, please help!!

The multilingual restart messages are from 'Kernel Panics'....they can be brought on by hardware problems, especially problems with RAM....this brings me to the 3 beeps....the beeps X 3 are an audio warning of a RAM problem...failed module >failed slot on logic board >RAM module came loose...etc

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IMac doesn't work

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