X61: Constant low humming noise After using for an hr. or so.

After using the notebook for an hr. or so, low irritating/humming noise starts that continues without interruption. The noise appears to be not from the HD side, rather from the opposite side.
Noise continues whether used with battery or power outlet or both.
Any suggestion and diagnosis would be of great help. Thanks.

The following is the comment I posted on 9/15. I have not received any replies so decided to search through other questions and came upon yours. Have you resolved your humming noise yet? I would love to know what this annoying sound is and how to get rid of it, if possible.
I purchased a Toshiba Satellite L505D-LS5002 laptop recently and am not happy at all with the annoying fan sound I hear for about 15 seconds every 50-60 seconds. It is too loud to ignore. I am not a computer "guru" and am just assuming it is the fan. What else could be making this annoying sound. It is a sort of humming/whistling sound that "revs" up for about 15 to 20 seconds and then stops abruptly, only to start up again in about a minute or so.

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