I'm sorry about the issue. Yes, your old Brother MFC-7860DW printer does work with your new wireless iMac computer. Please download and install the Printer Driver and Scanner Driver at the Brother website below:
, there, click on Search button, and continue.
- Once done downloading / installing the driver, you can click on the Apple logo / menu at the to, then click on the System Preferences, then click on Printers & Scanners, then click on the + (plus) button at bottom left to add your printer.
Please reply at the box below to continue. Thank you.