Black screen, X-shaped cursor on boot

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http://crunchbang.org – Just to point your a direction after reading your issue description. Because startx works just right (I imply from your post), It seem like for some reasons your login manager does not start the window manager (opebox). If you use Slim, check the file ~/.xsession for the line:openbox) exec openbox-sessionor comb through it to find out what was wrong.And the proprietary driver is not that temparamental ^ ^, it happen only your whole system has a big update, and in that case just reinstall it.Good luck! (HowTos)