My iMac recently started making random beeping noises. They are all different pitches and lengths. Nothing like a notification. Also does it with the sound muted. I've deleted Skype (several people recommended that) and restarted & shutdown. Please help!

This has been going on for a few months and seems to be getting worse. At times it will be frequent, other times only a few random beeps an hour. Seems to be worse when something is loading or "thinking". I have a video of the beeping sounds I will upload when I get home as it won't let me do it here at work. Any suggestions are greatly appreciated, it is driving me crazy! I'm also worried it will crash on me.

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
You could also check your widgets.

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