Original post by: rj713 ,
Hi, I think you may have a bad power brick for two reasons 1. Unit should run fine with just the AC power--I've done it many times on T42's I have owned. 2. The fact that the battery is not charging leads me to believe it is not receiving an input. Try to borrow another brick and see if everything works--I would try it with the battery out first. If this cures the problem the bricks are readily available on ebay for reasonable cost. If it doesn't work get back to us and we will look into it further.