Question HP DC7800 Memory Compatible

Oct 12, 2019
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Hye all. I just format my HP 7800 CMT from win xp to Win 7 Pro. Everything is good. Only the issue is, I cant upgrade my RAM.. I have few unit RAM 1GB but only 1 is working. Other RAM is giving beeping alarm (5 beep 2 times). I also got one 1 unit 2GB Ram which I know my mobo support max to 2 GB per slot. I even follow the memory slot configuration from the manual but not even 1 is working unless I use the black slot with 1GB RAM is working. Is that mt other RAM is spoil? From the picture, only SAMSUNG brand is working..

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