My printer ( Canon iP 3500 ) doesnt print. Everything is conected right but is shows that the printer is offline. What can I do ?
The usual things would be to double-check cable connections, power, communication, etc. (sounds like you've already done that). Verify also that you don't have a bad printer/USB cable as well. If nothing is printing after that, then try reinstalling the appropriate drivers for the device (forgive, but being a "Windows guy", it may be somewhat different in the Mac world). "Channeling the spirit of jboy..."
system specifications = Macintosh That is very unhelpful, Macintosh is a range of computers since the 1980's
Googling is quicker than waiting for an answer....