Description of problem:
No graphical video output

Version-Release number of selected component (if applicable):


How reproducible:
always

Steps to Reproduce:
Boot in graphic mode or
boot in text mode and execute startx
  
Actual results:
- garbled screen, random pixels lit (DVI) or blank screen (analog)
- sometimes X hangs the pc, requiring the reset button
- when running RHEL4, it is sometimes possible to recover by doing Ctrl-Alt-
Bckspace and run a 'setsysfont'

Expected results:
graphic screen

Additional info:
Hardware:
AMD64 3000+ CPU on Asus A8V mainboard with 1 GB RAM
XFX GeForce 6800LE AGP videocard
ViewSonic VP930 LCD monitor

The screen is currently connected both via DVI and an analog connection (via 
KVM switch). I did some checking by using only one connection and/or the KVM 
switch removed, but it didn't seem to make much of a difference.

The same problem exists in RedHat Enterprise Linux (RHEL) 4.

Doing an install in graphical mode works however.

I am not at that particular machine right now, but I will post the logs later 
today.