My 27 in iMac mid 2011 will start making a beeping sound, like a stuck keyboard key.  It will start up for no reason and it will stop if I hit the keyboard, only to start again.  Any idea how if stop this?

My iMac will start beeping like a stuck key.  It started this after updating to mountain lion. and after I updated memory to 20 gigs (2x 8gigs, 2x 2gigs)
I have a seagate thunderbolt back up drive attached.
The beeping starts at random times even when the computer ( and me too) are sleeping.
Help!!!
Thanks
Georgia

Running Firefox with addons disabled is no solution. The addons are the only reason I use Firefox! Please fix this before Google completely takes over my desktop!

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