I'm sorry about the issue. There are many versions of PC Windows, such as XP, Vista, 7, 8, 10, etc., and there are many versions of Mac OS X version, such as 10.5, 10.6, 10.7, 10.8, 10.9, 10.10, etc. So whenever you buy a product, you should always check if your computer version is compatible with it first.
But can you please click on the Apple logo / menu, then click on About this Mac..., then tell me your Mac OS X version, so I can check. I may have a way to get this printer working on your Mac computer.
And to confirm, the Mac computer is the only computer you are having issue with the printer right?
Please reply at the box below. Thank you.