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You should memtest each stick on its own. Change settings in BIOS to match the sticks advertised speed. You might have to toggle XMP/DOCP on or off. Probably check timings and voltage, too.
And you’re probably better off running 32 GB in dual channel mode. Unless you consistently use more than that, the extra speed is better than extra memory IMO.
Wait, are you running it with the dead stick in?
You should memtest each stick on its own. Change settings in BIOS to match the sticks advertised speed. You might have to toggle XMP/DOCP on or off. Probably check timings and voltage, too.
And you’re probably better off running 32 GB in dual channel mode. Unless you consistently use more than that, the extra speed is better than extra memory IMO.