toshiba c855-s5206 won't boot past toshiba leading inovations screen

Note: If this problem started after an update (or system reinstall), please make sure the laptop is not connected to the internet in any way before you use the following instructions.

Try the following...

1. Power off the laptop.
2. Power on the laptop.
3. As soon as you see the rotating loading circle, press and hold the Power Button until the computer shuts off. (You can do this just after the name and just before it resets as well.)
4. Repeat this process a few times until you see the "Preparing Automatic Repair" screen.
5. Now you want to let the laptop boot to the "Automatic Repair" screen.
6. Click "Advanced Options" and then select "Troubleshoot".
7. Here you want to select "Refresh your PC", if you do not wish to erase data, or "Reset your PC" to erase all data and restore your system.
8. From here just follow the screen instructions until the recovery is completed.

NOTE: You will need to get into the "Advanced Options" in order to get the "Refresh Option". This choice will keep your data, but any programs installed will be lost.

Do not do a "Reset" as that will wipe all data you have on the laptop.

When it goes to the 'black screen' is the computer by any chance actually on? Any signs of life at all? Lights, internal sounds, etc.

Immediately after turning it on, before the rotating circle appears, simply press the zero key, then follow the steps.