I bought a used Mac Mini (2.0GHz, 4GB Ram-seller bought in July '09) this last week. It has Snow Leopard (10.6.1). It started off with trying to install my HP printer that is shared out on a Windows XP machine. Originally when I turned on the Mini, I could see all the Windows machines (two Vista and one XP) machines on my WIFI network. I used the printer & fax function in system preference to add the printer (I could see it in the list under Windows). I sent over a couple print jobs, Mac shows it is gone, Windows machine shows the job in the printer Queue. Eventually the job simply goes away after 1-2 minutes with nothing coming out. I worked on it for a couple hours and then decided to try again today. I read several other sites that say that this may be a common/known bug. If that is it, then just tell me and I will wait for a fix/patch. A post on MacWindows.com said check to see that /etc/cups/printers.conf doesn't have a line "AuthInfoRequired username,password" - if it does remove it and retry. Where is that file? I searched using Finder and can't find it.