I just got a new Dell Latitude C640 to replace my old C600. I need a 90 watt power supply so my laptop can run the full 1.6Ghz with my dock instead of 1.2Ghz. When it boots up it tells me to get a 90 watt power adapter at my local Dell dealer. Anyone know of one in KC? (Outside of the dock, the power adapter works fine but gets REALLY hot).