I purchased 1 GB of RAM to add to the 512 MB pre-installed on my computer (Compaq SR2150NX) using the crucial.com tool to help me select what I needed. The new stick works great, the only problem being that now the old 512 MB no longer works, though it will work if I remove the new 1 GB stick. After talking to Crucial, they tell me it is a RAM density problem, which is something I know nothing of.
The chip I purchased is the CT12864AA667.8fe
Basically, then, my questions are, does anyone know about this problem, how do I determine what density I have on my pre-installed chip, and is there anyway to get the two to work together?