I have a toshiba l750d that had windows 7 on. I upgraded to windows 10, and nothing will start up. The toshiba logo comes on, then a blue screen appears with an error message advising to search online for 'inaccessible boot device'. I've tried pressing zero when starting, f2 or f12 when advised to and tried pressing f8 but nothing seems to work. Can anyone help please? Also, I didn't receive any discs with the laptop.