Originally Posted by eugened
Doubt it is a Software issue. Are you sure that the external power supply is working correctly. I am not familair with that model, though sometimes, laptops have several conductors in the power supply. Make sure you have proper voltages on all the wires. You may have to do some research to determine what the voltages should be.
Try a new charger/power supply. See if that clear up the problem.
If all else fails, it seem like the internal charger for the battery is broken. It may be able to be fixed, but it will probably take some work.