I have an old Windows 7 Toshiba Tecra A9 with a locked BIOS which won't let me boot off anything but the internal hard drive. I sadly lost the BIOS password a long time ago. I am however administrator on this machine. Is it possible somehow to replace windows by linux in such a situation?
You can use wubi https://wiki.ubuntu.com/WubiGuide or you can try to remove the password by using http://thegeekdaily.com/easily-reset-bios-password-with-pc-cmos-cleaner/ or by taking apart the laptop and removing for a few seconds the cmos battery.
Real nice solution. Are you familiar with PLOP?
Just download it and save it then you need EasyBCD
Then you should configure EasyBCD to boot from your iso file
Then you should be able to see a new option on boot. Enter it and you will something like this:
Which enables you to boot from anything you like. CHEERS!