Missing / No Login Window after Boot up
Mac Mini server running 10.6.7 OS X Server. Standard specs across the board with the 1TB storage. What happen is the machine boots up, you see the background "galaxy" backdrop and the mouse, but the actual 'Login' window to log into OS X Server never comes up. The machine is connected to an HDMI -> 21'' Dell screen. We've also tried the Mini Display Port to VGA adapter to another screen but with the same issue.
The services seem to come up fine and be working properly and we can remotely manage the server using the Server Tools and SSH no problem. In fact, I was able to update it from 10.6.4 to 10.6.7 using Server Tools remotely connected to it.
If you try to 'Remote Desktop' to the screen, after a reboot, you can remote to the screen, it will come up and open to a black only screen but that's it. If you try to 'Remote Desktop' to it again, it will just time out, unless you reboot the machine and then it will open the windows again but only to the black (repeatable cycle).
Its clear the hardware is fine without he mouse and background seen fine so it have to be an OS X issue. The machine has been this way for a some time (we've just been remotely administrating it) but its getting to become a significant pain.
Any suggestions?
Mac Mini, Mac OS X (10.6.7), Standard Mac Mini 1TB Server Model