I have an iMac 2011 model. Keep it up to date. When I try to turn it on, I have a blank screen and a series of beeps. Tried pressing the command and R keys. But it keeps beeping. Anyone experience this before?

Can't turn on my iMac. Keeps beeping.

Is it 3 beeps then stops then 3 beeps again? If it is that is a RAM error.
Look here for details on the beep codes.
http://support.apple.com/kb/HT5860?viewlocale=en_US

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