@jblah, Welcome to the HP Support Community!
Do you get any errors while printing?
Are you using the HP Smart app to print from the PC?
Check the connectivity between the printer and the MAC.
Make sure they are connected to the same network.
Run HP Print and Scan Doctor to diagnose and fix any driver issue
Click here to download the file. Once downloaded, make sure to run the file to start the installation and click on 'Fix printing'.
Hope this helps! Keep me posted.
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Have a great day!
KUMAR0307
I am an HP Employee