X won’t start up with compiz? Xorg log says it’s stuck at initializing extension GLX? glxinfo segfaults in libc? You have an Nvidia card and tried everything to bring life to compiz?
Boot into recovery mode, reinstall the proprietary Nvidia driver, delete /etc/ld.so.nohwcap and suddenly everything starts to work again after hours of frustrated X torture. Of course I’ve found this forum post after I found out the same solution… :)