Tablet PC 2005 Input Panel won't work.

Are you pressing down firmly enough? If not, sounds like the digitizer may have a problem... The digitizer is the layer in front of the lcd, it's job is to pick up the signal from your pen and send it to the motherboard. The motherboard should have two connections to the screen, one to the lcd itself and another to the digitizer. If you remove the screws on the bottom of the tablet you can take off the keyboard and see if both are connected right.