Just a few suggestions, let me know which ones you've tried.
Have you tried the rest option?
- Power off the laptop, unplug the AC from the unit, remove the battery, press and hold down the power button for 30 seconds, replace the battery and AC, power on, if you see the Toshiba logo, press the 'F2' key to enter the BIOS Setup, in setup press 'F9' to load setup defaults, press 'F10' to save and exit, and then boot into Windows.
Have you tried a boot disk option via the DVD or USB?
If you have access to another computer you can get the Windows 10 install and go through the repair options.
https://forums.windowscentral.com/e?...token=sXO5ZpCT
There are other boot options around if you want to go very basic.
MS-DOS Boot Disk Download | AllBootDisks - Providing Free Boot Disk Downloads. MS-DOS to Windows XP.