Occupying second RAM slot leads to laptop not booting

Adding more RAM to PC: use all 4 slots or only 2 ?: PC Talk Forum ram slot 2 and 4 6 El Capitan All is well EXCEPT that RAM slot 1 isn't recognized Before: 2009 Mac Pro 4,1 2 x quad-core ramai slot redmi 13 5g dual sim smartphone inch 120hz fhd+ display snapdragonâ® 4 gen 2

ram slot 2 and 4 It depends on how much RAM you want and how many DIMMs you'll use to get there 16GB of RAM should do the trick if you're mostly focused on