I have a 2012 envy 15 with Win8.1 Update 1 and a few days ago, i noticed that there was a newer version of my graphics card so I decided to update it.
After the installation, the computer screen became black and I only was able to see the mouse pointer, So i waited for almost half hour and then decided to turn of my computer. I restarted it and it kept seening a black screen (the windows logo aperered during the boot).
As I couldnt do anything with my computer, I decided to Refresh it in hope that it will return to a good state. During the refreshing the pc restarted but the power light started blinking , like the computer was at Sleep, and when the refresh finished, the screen was good, but the light kept blinking.
I tryed to shutdow the computer but when i turn it on again I didnt ear the Cd rom making the usual noise and the lights where blinking.
So i decided to maybe put it in sleep, but when i tryed it, the computer screen when black forna few seconds and the pc went wake imideatly, and when i try to put it to sleep again, the Sleep option was gone.
Then I thought that something went wrong with the refresh , so i clean install windows from a bootale usb drive since the CD wasnt working..
But that dindt work either, and to make things worst all my computer fans stoped working.
So now I end up with a pc with a clean win8 install, the power lights keep blinking (both power buton and the side light), no ability the sleep the computer, no cd drive and no fans.. 
Does anybody has any ideia how to start solving all this problems?