Default bios password toshiba satellite a135-s2276 (by 2 users)

what you need to do is pull both the laptop battery as well as the cmos battery. in some instances, the battery can be pulled, but on other models, i have seen the battery as an actual physical part on the motherboard or somewhere where it is not easily accessible, in which case you need to clear the cmos by using a jumper on the motherboard, since it is a laptop, they are all different. you may need to see if you can locate a copy of the motherboards schematics and go from there.