X won't start in fedora 16

[Peter Lesterhuis]

Hi,
When I boot all seems to go well at first. But after the log-in screen a 
message pops up: "Oh no! Something has gone wrong" etc. I am advised to 
log out and back in again, but the problem occurs every time. The weird 
thing is that when I hit the windows-key the ususal X-screensaver 
appears. But when I try to launch an application I get an black screen 
with the error message again.
When I boot in rescue mode and try to start X it fails.

I vaguely remember having run into this problem before, years ago, but I 
don't know how it was solved

Does anyone have a clue?


Peter