PC won't boot up when using dual channel RAM placement

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2 CPU Octa-core and GPU Adreno 710 It have 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM 1, 3, 5, 8, 19, 34, 38, 39, 40 And the system is able to boot properly with dual 3600MHz RAM installed to A2B2 slots Please use only the minimum bootable devices such as

pg slot demo play I build computers and the RAM should always be in the first slot on the left closest to the CPU If there is a 2nd chip it should be installed  put RAM only in Slot 3 and try it I suspect all of the slots will work alone, due to SamForbis' answer below Knowing Slot 3 is trouble