Hello I'm having the same problem guys,,, please help out!!
I get this error ->

XIO: fatal IO error 104 (Connection reset by peer) on X server "0:0"
after 0 requests ( 0 known processed ) with 0 events remaining.

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Let me explain
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I had somehow changed my default window manager to twm and then, i couldn't find a way to change my window manager, so i did, locate *twm* and deleted everything *twm* .. and now when i do startx or even boot my computer , it says i cannot start the x server....

Please help me ouT!!! How do i configure it so everything gets back to normal!
THanks!

I AM USING FEDORA CORE 2

The "switchdesk" command would be one way.

Well, what do i do after i type in switchdesk GNOME or switchdesk KDE or w/e
Do i restart or something? I need to get the X server to start first.. and i am in server mode or w/e right now? LOL

Well, nobody can read your mind to find out what files you have deleted. Where exactly your X server fails, should become visible in its log file below /var/log.

You could start an X session manually with "startx" or restart the current run-level.