Im pretty sure it was compaq laptops at least older ones, you take out the battery and unplug it. Wait 10sec and hold down the power button while u turn on the computer and keep holding it for another 5 sec and it resets the bios. Im not sure if it will reset the passwords too but, id say its worth a shot. Some laptops actaully do have jumpers and it could be as easy as finding the cmos battery. Check under the keyboard, in the area where the memory goes and underneath the battery I have found them in all of those places, good luck!