Satellite Windows 8 laptop will no longer boot up after performing a power cycle

I have a Satellite C855-55107 laptop. It had been working fine, and one day starting this problem: When booting up, it would bring the desktop screen up, and would not let me get to the sign in screen. I went to the Troubleshooting Help here and performed a power cycle. Now, it won't even boot up. The power is working fine. What do I need to do, and what do you think caused the original problem?

Hi! bec! I don't run W8. You could have picked up a Virus ect. Hard to really tell. There will be better replies during the week. I would restore back to factory.If you were infected, that should cure that problem. You could also make a system repair disk and try to boot with it. It can be made with any computer that is running W8. If you don't have that option, I guess it's back to factory.
http://forums.toshiba.com/t5/System-Recovery-and-Recovery/Creating-a-System-Repair-Disc-for-Windows-...
THROUGH F12 AT STARTUP
To access the System Restore, Refresh and Reset options using the F12 option at startup, perform the following:
If not already, ensure the computer is completely shut down. How To: Shut Down a Laptop with Windows 8
Now restart the computer by pressing the power button - IMMEDIATELY start tapping the F12 key on the keyboard until the "Boot Menu" screen appears.
Using the arrow keys, select <HDD Recovery> and press "Enter".
On the next screen you are asked to confirm if you want to contiue with recovery. Select "Yes".
The computer will bring you to the Advanced startup screen.
Select Troubleshoot. Under Troubleshoot you will see “Refresh” and “Reset”.
Select “Advanced options.” Located here is "System Restore."
Plese read this carefully.
http://forums.toshiba.com/t5/Windows-8-Knowledge-Base/How-To-Shut-Down-a-Laptop-with-Windows-8/ta-p/...
I Love my Satellite L775D-S7222 Laptop. Some days you're the windshield, Some days you're the bug. The Computer world is crazy. If you have answers to computer problems, pass them forward.

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Thanks for checking in, BDAQua.
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Thanks for checking in, BDAQua.
Problem solved.
In the docs that came with my Powerlogix accelerator card, I found this sentence buried:
"If you reset the PRAM, the NVRAM code for OS9 compatibility is cleared, so you will have to boot from the Firmawre Update CD and perform this process again in order to boot in OS9."
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Gratefully,
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