Monitor black out


In Runtime
When I boot up my computer, I get a few seconds of black and then the Windows loading screen with the scrolling blue/green bar. Normal, right? Then it goes black as if it's about to go to my login box but it stays black forever. I've tried it numerous times, restarting it over and over. I had just run a system cleanup with the program CCleaner and was restarting when it happened. I made a system restore right before the cleanup, but that's no good if I can't access it because I can't view my desktop. Any help?