[ubuntu] startx problem

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http://ubuntuforums.org – Hi! I've been running Ubuntu 10.04.3 for over a year now. Yesterday morning, I installed some updates, then turned my machine off. After turning it on again, I discovered that I was not able to log in; my computer gets stuck at the ubuntu loading screen (the one with the word 'ubuntu' with the five dots underneath). Pressing any button/key does not work, but the machine shuts down when properly when I press the power button. I restarted the machine and went to the recovery mode. When I run 'startx', I get this message: Code: Fatal server error: Could not create server lock file: /tmp/.X (Hardware)