Laptop won't charge when turned on
Hey, guys, my brother-in-law just presented me with an interesting question. When his laptop is turned on, the AC Power Supply doesn't work. It only charges when the laptop's off. Unfortunately, though, his battery's also shot, so it only stays charged for about 20 minutes. He doesn't really carry it around at all, so he really just wants it to work when plugged in. Any ideas if the problem lies in the battery, the AC adapter, or neither? Or both? Thanks.