My RAM dropped from 3GB to 1GB. I tried to replace both RAM boards (2, 1 GB) with new Hitachi manufactured circuit boards sold at Microcenter. The Pavilion PC would turn on with one new/one old but would not go to homepage. I put both old boards back in & was able to get to homepage, slowly. Are there RAM boards with HP specific software programmed on them as replacement parts? Where can I buy these?