So you think that with time the ability to lock a signal in the monitor has wandered out of spec enough that it means it will work with some monitors but not others?

Well I got a scope hanging around I could poke with but I could more accurately see what the sync frequency is with a counter I have. I just need to find where I put that damn power cable HP used.

It's critical that I get this monitor to behave, otherwise it's a sore thumb in the Absolutely All Apple system I'm working on.