Lockup on changing X sessions

From: Captain Dondo (yan_at_NsOeSiPnAeMr.com)
Date: 03/29/05 

Date: Mon, 28 Mar 2005 19:42:09 -0800

I run 3 X sessions on vt 7, 8, and 9. I have been doing this for a long
time with no problems.

I recently added 2 scsi drives to the machine and installed Fedora Core 3.

Ever since then, the machine will lock up on changing X vt (CTRL-ALT-Fx).
The kernel will remain running, as I can ping the machine, but otherwise
it is completely dead. The screen is black, I cannot telnet/ssh/anything
into the machine.

The machine has a recent 550W power supply, so I'm fairly confident that's
not it.

There is absolutely nothing in the log files that would indicate any sort
of problems with anything - hardware, etc.

Any thoughts, ideas, etc? 

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