You have re-installed the drivers (latest version?)and checked the settings, so that one step forward.On re-boot you still have no communication, so this could perhaps mean something more serious.
You could try click here and see if they have an answer. Printers like the Z65 are so cheap nowadays, it may pay to look for a replacement, with warranty and manufacturers support. Lexmark will also provide technical advice for your problem,I have used them in the past, and find that they are fairly responsive.