I normally don’t login to my domain controller that frequently as there aren’t much changes I need to do, especially on a lab environment. It was probably about a month ago that I had logged on to my domain controller, Server 2008 R2 Std, to reboot the server after patch installation. I never really logged back as my network was functional (so I guess I didn’t have to). Well today, when I tried to RDP to the server (HP Proliant Microserver) to create a test userID, all I got was a blue blank screen after I entered my domain credentials. I thought the GUI may still be loading as sometimes loading winlogon.exe can take few minutes but I got nothing for 15 minutes and longer. I tried Ctrl+Alt+End in RDP session and clicked on “Task Manager”. Again nothing happened. Then I tried Ctrl+Shift+Esc (should launch Task Manager in remote session as well) that went in vain as well. Not knowing what's going on and literally lazy to look into the event viewer of the DC, I restarted the system. I then tried RDP’ing back – same results. Tried the steps again to get to task manager to see if I can execute explorer.exe but no success. Then I physically went to the server for a logon and I got the same blue screen!