I've got a Shamrock monitor here, I have no clue how old it is or anything, but it's always worked fine for me. I installed RedHat 9 with an extra Compaq monitor, but that's not in very good condition (it has lighting problems). Then I physically moved the computer to the Shamrock monitor, and it doesn't want to work anymore. Whenever it loads anything with the X Server (either the login screen or the installation screen from the install disc), the computer just spontaneously reboots.
My current comp situation is this: I want a Windows comp AND a Linux comp, but I only have 1 working monitor (the Shamrock one). I have a Linksys device that can hook two computers up to the same monitor, keyboard, and mouse, and that's what I'm using. However, plugging the keyboard/mouse/monitor directly into the Linux computer doesn't make a difference, so there's no problem with the extra device. What surprises me is that I used to have RedHat on a second hard drive in my Windows computer, but it was too much work to reboot each time I wanted to switch operating systems.
The only odd thing I noticed is that Linux's auto-detect found the monitor to be an "Unknown Monitor", but there's nothing else to show for its odd behavior.
Anyone have any suggestions? I just tested it out with the old monitor and it works fine...