Why is my iMac making a soft beeping noise?

My iMac is making a soft beeping noise. There is nothing visibly wrong, I just dont know why its beeping. Please help...

Beeps on startup:
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images.
5 beeps = processor is not usable
http://support.apple.com/kb/HT2538

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