i bought a stick of ram a few months back..and it wasnt working. ive posted on some forums but none of them were helpful..so hopefully this site can. i have a fujitsu n5010 laptop and it can hold 2 gigs of ram. when i bought it, it came with 512mb (2x256) pc2700 ddr333. its from micron technology. i knew that cause i checked the specs using cpuid. i decided to upgrade my ram to a gig so i bought 1gig of ram from frys electronics. same specs everything..or at least i think it is..its a corsair 1gb sodimm and its the valueselect one. i put it in just by itself without the other 256 and it worked for a while..then when i turn on my laptop it doesnt work and it gives me a beep like 1-3-4-3 I THINK?? im not sure..but yea it meant something about 512k test? the laptop goes on but screen is just black. and people told me to do that (512k test?) but i dont know how to heck to do that! whats wrong? what can i do? i even took it back and they said nothing was wrong with it and that it works fine with the factory installed memory brand that i bought it with. you think i have to have 2 sticks of 1gb for it to work??? i tried all combinations. first slot only second slot only. mixed the brands and memory. (1gb and 256mb) still nothing..i even asked in the forums and they said that corsair was one fo the best memory brands and kingston kingstone whatever it is..was the other one. is patriot good? cause thats the most expensive one next to corsiar the one i got thats left at the store..i even check corsairs site. and they have my laptop and memory everytyhing..and it doesnt work..please help..thanks so much..sorry for the long post.