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No, PSU rated for 8.4 amps. Volt/amp meter hits 7.2 amps max when heatbed and hotend are on. I am 99.999% sure it is not PSU.
I can move everything around using manual controls with the heat bed on, hotend on, homing, 7.2 amps max.

Still, I can disable the heatbed as a test, that should be easy enough.

I have Z probe AND endstop. Funny, it seems all mendel type printers would have Z min end stop. Connecting a Z probe should be no different than any other type printer. (I am new to Z probes)

I think the next thing to do would be to start over with a new marlin folder, new configuration.h, and retest using settings from wiki without Z probe stuff, just follow wiki, disconnect z probe. This is what I will do now.