Two days ago I experinced something same. And today also gdm wont start. I do not know, if this is same bug, but i have same black screen when run the PC.
I use Sys Rq and restarted pc and GDM apears okay. i have nvidia-glx-new driver a and Hardy ** Attachment added: "Xorg.0.log.old" http://launchpadlibrarian.net/14202990/Xorg.0.log.old -- [hardy] GDM hangs on a black screen upon startup https://bugs.launchpad.net/bugs/203825 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs