my MB has 4 memory slots it will only use 2 of them if i load all 4 slots up it is dead i have changed the cpu and 2 different kinds of memory single sided chips vs double sided chips the max i can get is 2 gig i even tried 4 512 matched modules from a working computer still no luck . i bought a bundle of 4 new old stock boards on a close out
none of them will work with 4 mem slots occupied. any ideas.