I've brought a HP NC4200 on eBay. Other than a few cosmetic issues it works fine except:
When the laptop is off, the charging LED is solid and the battery charges fine.
When the laptop is on and the charge is around 0-10% or around 50% the XP battery icon is constantly jumping from AC Charging, Just AC and battery. Other times it works like it should do, solid LED and the AC charging icon.
Same thing happens in Xubuntu too.
The laptop runs fine without a battery so it can't be a connection issue with the charger lead/plug.
I thought it may have been a BIOS issue, so I updated the BIOS to the latest version, but the problem still persists.
Any ideas?