Switch from X to command line wityh ctrl-alt-F1 or ctrl-alt-F6.
Get back with CTRL-ALT-F7.
Start extra X sessions on F8, F9, F10 etc and switch between them.
linux 3 at the kernel prompt starts linux in text mode, then you just run the Xconfig
tool or exit, edit the /etc/X11/XF86Config and change the default
res to something that works. Better yet, set your X to use multiple
resolutions so you can cycle through them with ctrl-alt-"+" and "-".
Then if you select a borked resolution, you can just drop down to
one that works.
Jeff Borders
revised 07/07/04