A week or so ago my Meteor CNC's controller PC decided not to (appear to) boot up. Probotix wants an arm and a leg for a new one, so I figured I'd see if I could deduce the actual problem before starting fresh with a new LinuxPC.
I took the hard drive out and put it in another PC to see if it still worked. I used the same monitor though and although I could hear grumbling of the drives there was still no image from the PC on the monitor. Not even the usual boot up sequence. On a whim I dug out another monitor that I knew had worked and sure enough it worked as expected with the PC. Put everything back together with the "new" monitor and it appears my Meteor CNC is alive and well again.
Lesson learned: Monitors can fail. Particularly inexpensive LCD monitors from Staples.,
4D