Found the problem - after crawling all in the underbelly of the machine - the power supply wire had vibrated loose. It was connected at the controller but not at the ps.
This machine is my workhorse been running for many years. After putting back all the original parts and going back to the originally installed Lasercut, the power and the flying optics work perfectly fine.
Lesson learned?-KNOW your machine intimately - every nook cranny wire bolt screw belt and so on! And check all of it!
I always seem to "blame" the controller but have found there are so many other itty bitty troubleshooters that need to be done!
I previewed the new Leetro Controller - dongles but the file types are no longer ecp - now ftp - the only way to use my library of ecp projects is to go to an another computer - export the ecp file as a plt and then bring into the new Lasercut 6.1 and then save as ftp - - I told Andrew too much work for me, so I continue to use my hardy MPC 6515. I am still fiddling with upgrading it to the 6535 but am not confident in the wiring and the warning they issued about the polarity & possible damage to the machine electrical.
If anyone has swapped out the 6515 to the 6535 - your advise would be greatly appreciated. Ken in Ohio sent me a photo of his machine, which came with the 6535 so I'm trying to sort it out.
Thanks for the responses - Have a fun day!
Vix