I have an HP Pavilion DV4000 laptop which recently experienced problems with the battery - the old battery would charge to 100% but if unplugged would go down to 0% within minutes.
I assumed a new battery was required - ordered one and fitted it, the laptop worked fine with the 50%-odd charge that the battery came with, but it wouldn't charge - it just says 'plugged in, not charging', and there is no charging light on the front of the laptop.
If I put the old battery back in, it charges fine, and the charging light comes on - I therefore assumed it was a dud battery as there was no apparent problem with the power lead.
I sent the new battery back and got another one - same thing happens, no charging.
Seems unlikely that I have two dud batteries (from two separate suppliers). There are no power settings in the BIOS that I can change, and nothing seems wrong with the control panel settings for Power Options.
Has anyone got any ideas?