New problem. Fired up the machine and clicked "Reference All". The machine referenced properly. While moving the Y axis with the jog controller, I eventually went the wrong way, and hit the LS. Nothing new with that, as I'm having trouble getting it through my head that Y home (0) is not where I expect it. Anyway, like many times before, I clicked the Reset button. Unfortunately, it doesn't reset, it just keeps saying "Limit Switch Triggered". The Diagnostics screen shows that the Y LS is triggered. I've tried powering off the 1100, rebooting the computer, etc., but nothing will reset the machine. The only way I can get it out of this condition is to open the Y axis coupler box, put a belt around it, and move the table away from the switch. After that, the Diagnostics screen shows that the Y LS is no longer triggered. You can then reference the machine and go about you business.
Any ideas on what is wrong?