Nermin,
After the very first update of my FC12_64 I've got the
same problem on a couple of Z800, and seems related to the video
hardware.
My Z800s has 3 disks, 1 for the boot and 2
1 TB in software raid1 and a runnlevel 3, so I can log in
normally.
A startx does a 2 seconds of heavy work on the
disks then reboots and no more disks are visible, so a poweroff is
the only thing I can do.
However, using the kernel found in the
installation dvd my Z800s runs fine.
The nomodeset solution proposed in the fedora12 bug
lists and the bios update from HP doesn't solved the problem
for me.
I'm still looking for a solution, even if the systems
are running fine.
If you are still interested, I will file you the
detailed description of my Z800s configuration ( tomorrow I
will be in office )
Filippo
Skype shinymetal-skype
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