When I try to log in there is no log in screen that comes up any more first thing. All I see is a blue screen with Windows 7 Professional at the bottom. This has happened both when I shut down and just log off the night before. Nothing happens when I press Ctrl Alt Delete either. The only way I can get in is to turn off the machine from the power box/strip and then turn that back on. This machine is on our network and should have the ability to have different users log in. I ended a few process's the other day on the computer and I must of done it to an important one. Please help