if you've already desoldered, and resoldered the ac adapter to the motherboard, it might just have a dry-socket where you need to solder it once more. did you use anything like resin to make it suck into the joint?
that sounded weird, but i don't exactly know the technical term for it..
probably looking to get $600 for my laptop. it's a p4 3.2Ghz with 1GB of ram, and FX5600 go video card. i ran World of Warcraft and Everquest in raid environments on it pretty smoothly with only 64MB video ram, so it's certainly an underrated combo with it boasting a 333Mhz front side system bus.
60 or 80GB ata100 hard drive, i don't recall at this very moment, and built-in wifi, new battery (OEM) as well as new AC adapter and laptop bag.
lemme know