My Desktop is Gone!?

I don't understand. I logged into my Knoppix 5 partition this morning and after it booted up it didn't go into the Desktop. Instead the boot screen just turned into a command line. I ran through some directories and it seems everything is still intact, I just have no GUI desktop. What can I do to get it back???

Odd, I rebooted and it came back. Rebooted again, it was gone. Rebooted the last 2 times and the Desktop is there? Oh, well, I can work with this annoyance.