I have toshiba satellite laptop L755-S5216, after turning on power, i can't see or do nothing because the error message appeared : enter password.
Go to youtube and do a search for "Toshiba Bios Password". You'll find several how-to's. I don't remember if there was one specific to the L755, but you'll get the picture. It doesn't seem too difficult.
Hope it helps, let me know!!