try turning off secure boot.
First of all, for C55-B5296, enter bios setup (F2 KEY).
- Then go to SECURITY OPTION and turn OFF the SECURE BOOT.
- Go to ADVANCE OPTION and in SYSTEM CONFIGURATION, change the BOOT MODE to CSM BOOT.
- Press F10 to save and exit.
- Plug your USB stick and press F12 to access the BOOT SELECT.
Thats all...
There is more advice here, this seems like a common problem -
http://www.tomsguide.com/answers/id-2281449/toshiba-satellite-wont-boot-usb-install.html
i found one fix was to change boot from uefi to csm but this might be counterproductive as win 10 boots off UEFI -
http://www.tomshardware.com/forum/64755-63-toshiba-satellite-boot
if you can boot off USB should try a start up repair and see if that can help
boot from installer
on screen after languages, choose repair this pc, not install.
choose troubleshoot
choose advanced
choose start up repair - this will scan PC and maybe fix this - will ask for logon info
other option is to try to get into safe mode and get a copy of your memory.,dmp file to upload it so we can see what that error was
boot from installer, on 2nd screen after languages, choose repair this pc, not install
choose troubleshoot
choose advanced
choose start up options
hit the restart button
choose a safe mode (it doesn't matter which) by using number associated with it.
PC will restart and load safe mode
the memory.dmp file should be on the root of C - this means if you open C drive, memory.dmp won't be in a folder, just scroll down.