Computer booting problem

jman13yahoo

Honorable
Apr 21, 2012
13
0
10,510
I have a custom build from ibuypower with an i7 970 CPU, 12 Gb of RAM, 700 watt power supply, 2 terabyte hard drive, and a separately purchased Radeon 7850.
My computer will be on and then ill leave it for a while and it will go to a black screen and the monitor in sleep mode, but when i try to reawaken it the screen refuses. Then when I power it down and turn it back on it starts to boot and the fans start turning but then stop, then again and stop, then finally boot. I installed the 7850 at christmas but only recently began having problems so I'm not sure if thats the problem. Im not sure if its hardware or software. Any ideas?
 

jman13yahoo

Honorable
Apr 21, 2012
13
0
10,510
I already do, and as I said the computer is on and running but the screen will not activate. The keyboard is lit and so is the mouse and all fans on the PC are running as usual