Similar problem: Fedora 6 --> right after udev loads, the screen goes
blank, and then the monitor flashes a "Video Mode Not Supported" box.
Fixed by renaming /ext/X11/xorg.conf to something else, so that X
uses its defaults (but max resolution is only 800 x 600). However,
after an auto-update of the kernel, the mouse cursor disappeared.
I put /etc/X11/xorg.conf back, but got the "Video Mode Not Supported"
problem again, so I couldn't use your fix.
However, by just removing the DefaultDepth line in Section "Screen"
within /etc/X11/xorg.conf I got back my X screen AND my mouse cursor,
and the max resolution is 1600 x 1200!
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