IMac beeps about every two minutes. Why?!

I got home from work today and my iMac (early 2009 model) was beeping. It beeps once every 2 minutes or so. I ran the Apple Hardware Test (I think that's what it's called - the thing I have to insert the install disc to run). It came up with nothing being wrong. I have absolutely no clue why it's doing this. My sound is muted and it still happens and it happened even when I was in the Hardware Test.
Could it be a memory issue?
Any suggestions on what is causing this and/or what I should do?
Thanks.

HI,
Three beeps in a row means there's a problem with the RAM.
More information here.
http://support.apple.com/kb/HT2538
Boot from your install disk and run Disk Utility. (Not the same as Apple Hardware Test).
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
*(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)*
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. *Make sure there is always 10% to 15% free disk space*
Carolyn

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