IMac responds to power-up with "beep-beep-beep-pause" repeat.

When I push the power button to power up my iMac (early 2009; 24"/2.66GHz/4GB) it responds with a series of beeps with the pattern of "beep-beep-beep-pause" and repeats until I power it down. The fan turns on, but I can't detect any other response. Does anyone know what this means?
Thanks...

andyBall_uk wrote:
http://support.apple.com/kb/HT2538 is more recent
So iMacs no longer beep? They tone now? I gather I'm reading that Article correctly.

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IMac responds to power-up with "beep-beep-beep-pause" repeat.

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