Screen goes blank?

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RH 8.0 w/all updates.

I have had 2 or 3 instances here lately (do not remember when it first
happened) in which the screen went black with a single green line on the left
side of the screen. They happen while I have left the session and monitor
running running for a while with no activity. I would think screensaver,
except that the system failure does not always occur and I have returned with
a screensaver image on the screen.

If I were to guess, it started after installing the last couple of kernel
updates. When it happened today I had Mozilla 1.3a open, a Gnome-terminal
session open with 3 tabs (one of which was logged onto to root and one of
which was doing a ssh session to a RH 7.1 system).

I left the terminal for about 30-45 minutes and when I returned, the system
was blank. I did a Ctrl-Alt-F1 thru F7 with no change and a Ctrl-Alt-Delete.
Evidently something trigger a system reboot.

About the only thing I can find in the logs is:

Mar 20 17:11:08 www gdm[956]: gdm_slave_xioerror_handler: Fatal X error -
Restarting :0
Mar 20 17:11:12 www gdm[2775]: gdm_slave_xioerror_handler: Fatal X error -
Restarting :0
Mar 20 17:11:14 www gdm[2777]: gdm_slave_xioerror_handler: Fatal X error -
Restarting :0
Mar 20 17:11:19 www gdm[2779]: gdm_slave_xioerror_handler: Fatal X error -
Restarting :0
Mar 20 17:11:25 www gdm[2781]: gdm_slave_xioerror_handler: Fatal X error -
Restarting :0
Mar 20 17:11:25 www gdm[911]: deal_with_x_crashes: Running the XKeepsCrashing
script
Mar 20 18:27:26 www init: Switching to runlevel: 6
Mar 20 18:27:27 www gdm[911]: Failed to start X server several times in a
short time period; disabling display :0
Mar 20 18:27:28 www rhnsd[901]: Exiting

and in gdm/:0.log.1 (and .2, .3, and .4):

XFree86 Version 4.2.0 (Red Hat Linux release: 4.2.0-72) / X Window System
(protocol Version 11, revision 0, vendor release 6600)
Release Date: 23 January 2002
        If the server is older than 6-12 months, or if your card is
        newer than the above date, look for a newer version before
        reporting problems.  (See http://www.XFree86.Org/)
Build Operating System: Linux 2.4.18-11smp i686 [ELF]
Build Host: daffy.perf.redhat.com

Module Loader present
OS Kernel: Linux version 2.4.18-27.8.0 (bhcompile@xxxxxxxxxxxxxxxxxxxxxxxxxx)
(gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)) #1 Fri Mar 14 06:45:49
EST 2003
Markers: (--) probed, (**) from config file, (==) default setting,
         (++) from command line, (!!) notice, (II) informational,
         (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/XFree86.0.log", Time: Thu Mar 20 17:11:23 2003
(==) Using config file: "/etc/X11/XF86Config"
pgetbl_ctl: 0x2560001 pgetbl_err: 0x304000
ipeir: 0 iphdr: 50c00004
LP ring tail: a0f0 head: 7260 len: f001 start 4e0000
eir: 0 esr: 0 emr: 3d
instdone: ff3a instpm: 0
memmode: 4 instps: 810
hwstam: 0 ier: 3 imr: 0 iir: 0

Fatal server error:
Active ring not flushed


Any idea on what to look for and where?






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