Only one channel of ram is working

Switch that same stick of RAM into the B1 slot and all is well I tried 3 different RAM sticks just to be sure They all work in B1 but not in

As you currently have eliminated the RAM as the possible problem with both working when used singularly in the same slot You need to eliminate

16 slot not functioning properly within 7 days from the date of delivery 4 Should the received product not align with the site's depiction or specifications, this

127 slot RAM SLOT NOT WORKING ,GA-H81M-S 2ND RAM SLOT NOT WORKING PROBLEM