I have two dells that are almost identical (dvd burner and HD space are the differences). I recently got a good price on 256MB RAM PC2700 for $25 bucks each, so i bought 2. Each of these computers have 512MB PC2700 right now, so i decided to put an extra 256MB in and bring it up to 768MB. It worked on my computer, but for my sister's computer (the other computer), the monitor wouldn't respond to the computer. It just stayed on Stand-by, as if the computer was off. I don't know why this is happening, they are the same speed, and it worked in mine, so why shouldn't it work in hers? I don't reall