Mac Pro (late 2013) Success

Usually we read about problems here, this details a success. Over many months FCPX developed several nagging issues when editing 4k ProRes HQ. Long time to open libraries, poor playback performance (rendered or not, high quality or not, lots of effects or not), slow response to timeline edits, often lost focus on timeline requiring clicking on project again, brief beach balling then recovery, slow rendering, long export times and other less frequent minor issues. Did the usual fixes (reset prefs, ran etrecheck, reset PRAM, NVRAM, SMC) no real help. Then things got much worse. Total FCPX crashes, infinite beach balling, could not force quit (even software restart did not work, after restart FCPX would not load and yet be shown as running by command-option-esc, had to do power switch restart.) Would not start in safe mode. Started cases with both the systems group and the FCP group. Disconnected everything except displays and one external thunderbolt RAID 5. No real help and then disaster: no video out to either of my apple displays. Genius bar verified no video out. Sent to repair central. They replaced the "Card CPU Riser", both "D700 Graphics Boards", the "Core Thermal" and some cables. Machine came back, updated Mojave to latest and about to update FCPX and then new issues: both "About This Mac" and etrecheck reported RAM problems (never seen before) also bluetooth magic mouse disconnected and reconnected every minute or two. Back to Genius Bar. Machine off to Memphis noon on Wednesday, back in my office before 3:30 on Friday. Replaced "Card CPU Riser" again. Replaced "Board I/O Airport/Bluetooth". No extra charges. Both times machine came back with internal SSD untouched. Updated FCPX to latest.

Worked in FCPX all day for a few days now and it seems like a new machine, much quicker and rock stable.

So don't give up! As the Genius Bar guy said when I asked him what if you can't fix it, "We WILL fix it..." and they did.