[Ti] Hard Drive Beeps

[Sambouka]

My Aluminum 1.0 Ghz has been giving internal scratching and beeping 
sounds. It sounds like a mechanical arm going back and forth. I am not 
quite sure if the sound is coming from the hard drive or the DVD drive 
(no cd or dvd is present at the time of the sound).

I have ran ProTools as well as DiskWarrior with no problems detected. 
Although the sound is infrequent, yet it was observed that it comes 
when there is heavy usage of memory. Might it be bad RAM?

Any recommendations or ideas on why this is occurring and how to solve 
it would be appreciated


Cheers,

Sam