Imac emits 2 quiet beeps NOT at Startup

So my Imac is running just fine as normal but every now and again it emits a quiet 'beep-beep.'
Have checked the console and nothing's showing up around the time of the beeps so I really haven't a clue what it is.
Any ideas?
Regards,
Mike

The power on self-test resides in the ROM of the computer. This test runs whenever the computer is turned on after being fully shut down (the power-on self-test does not run if the computer is only restarted).
If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance.
1 beep = no RAM installed
 2 beeps = incompatible RAM types 
3 beeps = no good banks 
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
 5 beeps = processor is not usable
In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.
http://docs.info.apple.com/article.html?artnum=58442
Evidence that your hard drive has actually failed may be provided by the hard drive sounds listed here:
http://datacent.com/harddrivesounds.php

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