Hello, I inherited an Optiplex GX270 with a BIOS/Bootup password. I removed the battery on the system board but to no avail. I need to go into BIOS and also to boot Windows but both need this stupid password, which I unfortunately don't have and no one seems to know (that's how I ended up with this "gift").
I would add to Elsbeth's reply that you should unplug the system from AC power before doing the jumper password reset. Sometimes the password will not clear if power is on the system when the jumper is pulled.