I am having problems getting it to charge. I had someone solder the jack, and it still doesn't work. I have to work at getting it to actually start charging on AC. If it DOES charge at all, it will stop for no particular reason, and then go to battery power. Then the battery drains in a very short time. I have checked the heat syncs, they are clean, so are the fans. I have also used different power sources, with the same result. Anybody out there have any other ideas? Thanks.