Hi, I am on a steep learning curve with my new iMac. The initial setup seemed to be going OK, but I was called away part way through. When I came back I had to login (fair enough) but the iMac resolutely refused to accept the password I had created and made a careful note of. After a search on this forum I manged to boot using Cmd-R and create a new password, however I got in a muddle with Keychain, and I now cannot do anything without a demand for the "Keychain" password popping up, which is obviously not the same one. I expect I have done something wrong but would be grateful if someone could point me in the right direction.