I have a biostar M7NCD pro (based on nforce2 ultra 400 chipset) It has 3 memory slots. (1 "A" slot by itself and 2 "B" slots close together). Got it off ebay so you never know what to expect. Installed 512mb stick of kingmax pc3200 in slot A and no boot, just a black screen. Reseated CPU, vid card and mem, same thing. Moved mem to slot B2 and it booted just fine. Worked fine for about a month. Decided to go with 1gig ram. Bought Mushkin basic pc3200 (2x512). Installed in A and B1(dual channel)...booted fine, got blue screen of death in less than an hour. Memtest shows mem errors. RMA memory, getting same thing. Now, my kingmax mem will work in A but gives errors. Tried mushkin in B1 and B2, worked longer but still errors. Using them one at a time in B2 slot, get errors with one and not other. Is it possible both mem and mobo are faulty? Using Kingmax right now in B2 no probs at all, I think i was even getting errors with kingmax in B1 at times.