Bonus points for getting no error messages out of the logs.
Install two dodgy TrueType fonts amongst scores one night, forget about it, then turn the machine on again next morning.
kdm breaks. kde breaks. startx breaks. startx konsole breaks... but startx xterm survives.
So... “konsole” into that yields a SEGFAULT (Signal 11).
Hmmmm. “strace konsole” into that yields consistent death after processing a font named Alphabet_2. Remove Alphabet_2 from /usr/share/fonts/....
“strace...” on that yields consistent death after BERLIN_REDRAIN. Sigh. Look forward to an afternoon with rm as your friend. Remove REDRAIN.
Everything springs back to life. Whew!