It sounds like your graphic card is broken, And/Or off.
Do you see any programs, that are gone, New programs, or just something that shouldn't be there?
For about three years ago, my Graphic card wen't burning, and my Hardisk too.
They couldn't recorver anything from the computer, assuming it was burned inside.
When you started the computer, were there any:
Bars on the screen, Was the Screen Flickering, Or just Glitching around?
The problem is massive, Seeing that Hardisk's are rarely hard to recorver.
It may just be the screen, Try to restart everything.
Computer Problems are hard to recorver', if it's the Hardisk.
Before everything of this happent, Did you have any computer problems, Such as:
BSOD's (Blue Screens of Death), YSOD's (Yellow Screens of Death), BSODK's (Black Screen of Death), Or RSOD's (Red Screens of Death.)?
The BSOD's are some of the worst a computer can get, Seeing that it might edit your Hardisk.
If you get the BSOD once, You can expect it coming again.
My computer have the BSOD, Seeing it's a normal Windows Problem.
Some of them are Harsh, some of them mild.
I am having the mild one, (BSOD -The mild one).
Hope you haven't any of these, Assuming they might edited your computer in that.
-Jack.