X61: constant low humming noise after an hr. or so

[falsafayg]

After using the notebook for an hr. or so, low irritating noise starts that continues without interruption. The noise appears to be not from the HD side, rather the opposite side.

Noise continues whether used with battery or power outlet or both.

Any suggestion and diagnosis would be of great help. Thanks.

[loyukfai]

Fan...? Mine has developed some humming recently as well, plan to have it fixed soon.

Cheers.