Having problems with your HP ze5478CL (dk567a) PC Notebook ?

Tried to replace/upgrade memory ram; now computer

\015 Tried to replace/upgrade memory ram o a hp ze5478cl (had techs at Best Buy do it); now computer will not work; it will not boot up; the op systen does not function; I just have a BLACK SCREEN.\015

Answers :

It sounds like they installed bad RAM or wrong RAM..did it ever work after brought it back from the store?
\015\012
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