Check the /var/log/boot.log - turn it on if not - BOOTLOGD_ENABLED=Yes.
Also at boot time try entering - dmesg > boot_msg   
There are other things you can do to get more messages. You can capture your
screen also.

Keep looking up,
Tim
-----Original Message-----
From: tclug-list-bounces at mn-linux.org
[mailto:tclug-list-bounces at mn-linux.org] On Behalf Of Robert De Mars
Sent: Tuesday, August 26, 2008 1:46 PM
To: tclug-list at mn-linux.org
Subject: [tclug-list] Dell Optiplex 745 - Will not reboot

Hello, and a good day to you all.  I have a small problem that I can not 
seem to figure out.

I have just installed Slack 12.1 on a Dell Optiplex 745 Desktop.  The 
box is all stock, but with a 4Gig ram upgrade.

I installed Slackware 12.1, and Slack is working properly.  My problem 
is when I tell the machine to reboot (  shutdown -r now   )   it goes 
through the process of shutting down, but gets stuck at "Restarting System."

I then have to manually power down the box, and restart it via the power 
button.

This machine will soon be headless, and is intended to run inter-company 
web applications & things of that nature.

Any thoughts why it freezes at "Restarting System.", or what I might do 
to correct this would be greatly appreciated.

Thank You Very Much!

Robert De Mars

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