Yeah, the z-ram card is installed.  I don't have a ProDOS disk, but the utilities disk loads up and will let me exit to dos.  If I understand the label correctly, that is ProDOS based.  Many of the program disks I have work, which makes me wonder if the problems I am seeing are due to disk corruption or hardware issues.  Some only sort of work -- for example, I have a word processor program that behaves weirdly (e.g., types letters instead of numbers when you hit number keys, while at the command prompt and in other programs things are fine)

How hard is it to remove the z-ram board?  I took a look at it last night with thoughts of re-seating it, but pulling it made me a bit nervous as it is in there pretty solidly.