Specs: Windows 8.1, Nvidia Geforce 550 TI, 1 TB Seagate harddrive (boots from), 2 TB Seagate harddrive, Corsair CX500 500W PSU

Background: I left my computer running while I was away for a week. I got back and it looked the same. Windows Firewall had a popup about allowing Blizzard's launcher which I clicked to allow. It freezes the windows but nothing else and I can not exit the firewall window. I close it in task manager. I open Windows explorer and it goes to fullscreen mode, but larger than it should where I can not see the top bar to exit it. I restart Spotify to update it, and it pops up with a window on how it can't because (I don't remember clearly and this may be wrong) either there is a write error or something was in use. I restart the computer.

This is where I am now. After restarting the computer, it turns on, the keyboard (which has a backlight) lights up and I can turn off and on the capslock and numkey buttons. But it doesn't seem to boot. I powered down everything, pressed the on button a few times, and powered it up, still nothing. I took out the 1TB Windows 8.1 hard drive and I believe successfully attached the cables to boot the the 2TB drive which has XP on it. However it still does not seem to be booting. At first I was thinking it was a hard drive error, but now I'm not so sure. Does anybody have any possible suggestions?

Edit: I should note that one reason I believe that it is not booting instead of being a screen problem is that along with it showing the screen properly before rebooting, Teamviewer shows the computer as offline when I check from another computer.