So it seems like the xserver with mga driver just quits without any error 
message. Do you have the possibility to log in with ssh from another computer? 
In that case, stop any X running, and run gdb in the ssh session:
 sudo gdb /usr/bin/Xorg
... now gdb starts and gives you a (gdb) prompt
 set logging file xorg-gdb.txt
 set logging on
 run
... gdb will then start X. If it crashes, you'll be back in gdb and can type
 bt full
 set logging off
 quit
... and you can attach xorg-gdb.txt

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Can not get 1024x768 video mode by undetected monitor and Matrox G100 8MB 
graphics adapter
https://bugs.launchpad.net/bugs/319363
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