Which two RAM slots to populate on a 4-slot system?

ram slot 3 and 4 not working   Dan ram slot 13 or 24

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slot machine jammer app for iphone 4 RAM memory RAM slots connect the random access memory to the motherboard RAM allows the computer to temporarily store files and If no RAM will work in slots 3 & 4 then the Mobo slots would appear to be the problem Filling all the RAM slots on