Hey there, @thomasfbyrne,

Thanks for posting in the Community. I'd be happy to help you with printing checks in QuickBooks Desktop for Mac.

Just to confirm, were you able to print other forms inside and outside QuickBooks except for checks? Also, are you using pre-printed check stocks from QuickBooks? Any details you can provide is extremely helpful for us to narrow things down.

If you can print on a regular paper but not on the pre-printed checks, it's possible that this is a printer related issue. I'd recommend contacting your Printer Customer Support so they can help you configure your printer settings. They can also provide in-depth instructions to get past the error you're getting.

Please update me on the outcome, @thomasfbyrne. I want to make sure you're taken care of. Have a lovely day!