I have a Tivo Series 2 TCD24008A that I recently had some issues with, but after replacing the power source seemed to work fine. A couple weeks later however, the fan stopped working causing the Tivo to shut down due to overheating. Naturally, I figured I'd replace the fan and be back in business. Unfortunately the new fan doesn't work either. Once I plug in the unit, the fan kicks for half a second, but then nothing. Is it possible the power source I installed is faulty? Or could something else be going on here?