If you automatically boot into X at startup and subsequently X fails, do
not ssume that you have to do a reinstall.
if you are using LILO then at the boot prompt just type in linux 3 and
it will boot to a command prompt, from there you can login and as root
run Xconfigurator to fix or just to reset (?) the Xserver.
A lot of people that I've talked to don't boot into X for this very
reason.
Also if X is crahing a lot maybe you should play around with the
settings in Xconfigurator until you get one that seems stable.
