Created attachment 106672 [details]
error 1

Created attachment 106673 [details]
error 2

Created attachment 106674 [details]
/proc/pci

Created attachment 106675 [details]
after reconfig

After 
system-config-display --reconfig
the system worked for 2 minutes, then crashed again.
Log attached. The iintel 815 is a very standard board, this is a shame
fedora fc3 does not work with it.

Some thing may be not clear. The system is up, network is working, I
can login remotelly.
On screen - garbage.
display switching Alt-Ctl-F1 Alt-Ctl-F2 and etc. does not work.

Created attachment 106676 [details]
xorg.conf for completeness

Adding
Option     "NoAccel" "true"
to xorg.conf seems fixed the problem.
See also 
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=133010

We've just released an updated xorg-x11 which fixes some bugs in
the i810 driver which are present in the official X.Org sources,
and cause problems on i810 and i815 video hardware.

Please upgrade to xorg-x11-6.8.1-12.FC3.21 and if the problem you
were experiencing still exists, please file a new bug report,
including all details, and attach new X server log and config
file, and /var/log/messages.

Thanks.