I had the same problem with my Sony VAIO VGN-P29VN. I haven't used it for a long time and then forgot the password (which I set by myself!). So I disassembled the whole thing and removed the battery for some hours. The battery is indeed that black thing connected with two cables (black and red) as seen on this picture: http://j.mycom.jp/articles/2009/02/1...mages/020l.jpg
But, as logicearth already said, this procedure did not reset the password. After I reconnected the battery and assempled the VAIO again, the password was still set.
I bought this thing used so I don't think that there would be any support by manufacturer any longer. Has anybody an idea what to do? If a wrong password is entered three times there is asked for an "OneTime Password" and some kind of key is diplayed (in a format like this: xxxx-xxxx-xxxx-xxxx). Is there ANYWHERE a key generator available which could generate this required password? If it is entered correctly, the BIOS password would be reset.
Thanks for any answer.
Greetings from Germany