I have an old Dell Optiplex GX620 with Windows 7 Professional that I have been using as a media PC hooked up to my Panasonic flatscreen. I normally do not shut the computer down that often, instead putting it into sleep mode when not in use. Last night when I tried to wake it up it just showed a blank screen with a cursor. I manually shut it down and when it restarted it would not boot up and went into a loop of restarting. I put the installation disk in and let the Startup Repair program run overnight. When I tried to start the computer the next morning it booted up to the point where it shows the Starting Windows animation and then goes to a black screen with a cursor. I ran the Startup Repair program again but it reported that there were no problems. I restarted again and again it proceeded past the starting windows animation but no further. I am able to move the cursor but it will not proceed past this point. I have tried booting up in Safe Mode and get the exact same result, black screen with moveable cursor. HELP!!!