Try resetting the BIOS. There should be some instructions in the manual on how to do it. There's probably a small battery on the MB. If you can get to it, remove it for a while with the large battery out too.
hi spooky, thought of that but battery seems to be hardwired to mb, don't want to go messing around with soldering iron, i thought they might be a jumper or something that could be shorted to clear password but can't see it, thanks for answering