The fan on my V2 Sky+ box is permanently on. Tried disconnecting, then reconnecting but after about 30 seconds it starts up again. It even stays on all day while the box is in standby. I upgraded the hard drive and I thought maybe it was running hot, but tonight I took the top off the box and the HD was barely warm to the touch. The HD is a bit noisy (WD Caviar) so i may swap it for another. Any ideas why the fan runs permanently, and any recommendations for a really quiet hard drive?