I'm sorry about the issue. Is the printer connected to the computer or to the airport / router with a cable? Is the connection wireless?
What's the status of the Wi-Fi/wireless light / icon on the printer's screen?
Are you still able to make a copy from the printer's glass (not print from the computer)?
What's your Mac OS X version?
What's the error or message when printing?
Please reply at the box below to continue troubleshooting. Thank you.