X config damaged by power failure

I had a power blackout this afternoon (in fact it affected most of the
country -- I live in Venezuela) and after coming back up my X
configuration was damaged. Basically the screen resolution was all wrong
and the Display widget (under Gnome this time) refused to change it to
something reasonable.

This is F9-pre, and there is no /etc/X11/xorg.conf file.

I switched to a console, did "init 3" and ran system-config-display.
This worked perfectly and created the xorg.conf file.

What I'd like to know for future reference is where does an
xorg.conf-less X server gets its configuration from? Is it stored in a
file somewhere, did that file get damaged by the power blip and thus
have strange settings in it (which X simply accepted without complaint).
If it's not stored but regenerated from hardwired settings, why was it
all wrong where previously it had been right?

I'm happy it all worked out, but I'd like to know what happened.

poc

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