I'm having trouble logging into one of my Desktops with Windows 7. I had simply locked my desktop and when I came backup, on waking up the monitor, I noticed that the screen shows the text "Press ctrl+alt+del to login" with the Windows 7 logo underneath on a black background. This used to be the default blue wallpaper earlier. On pressing ctrl+alt+del as usual, I see no user account displayed and no text box to enter the password. Only the "Ease of Access", "Cancel" & Shutdown buttons are showing on a black background. I can't enter the password anywhere. I restarted the machine to check if the problem disappears but to no avail. It still doesn't gives me the password box and a black background.
I've tried memory tests and startup tests from the boot menu and its still not fixed. Even safe mode gives me the same login screen without a place to enter my password. When I try to Remote Desktop to this machine from another machine, it gives me the same 3 buttons on the default wallpaper and no place to enter the password or select a user.
Any ideas on how to fix this. Any help will be really appreciated.