So I picked up an extra computer today. Just to stick in the office and leave for web surfing and as a backup in case anything happens to the others. It is an HP pavilion. I know I know, but it was cheap, and I have exp with them specifically . For $100 you cant beat it. xp, office, 30gb hd, it is 800mhz. So my question is about the ram. It came with 128, but I would like to add more. I added an old stick I had lying around and got nothing. I didnt take the one in there out, so I cant read it well, but it is pc100. So is the one I put in. Do I need to make sure they are the same type pc100? Do I just have a bad stick maybe? Can this old pc take more than 128? Also, is there any downside to leaving the new stick in whether it works or not?