Q: I want to play a blu ray disc in my  iMac mcomputer, is that possible?

Hi

NO - not as it is.

YES - if You buy a Blu-Ray player that can connect to Your iMac.

I use a PlayStation3 to view my BD-disks - but this don't connect to my Mac only to the TV.

Yours Bengt W

Sure, you can. If there are Blu-ray folders or ISO files in your Mac,  you can play it by Blu-ray Player Software directly. If you want to play Blu-ray discs, you also need one Blu-ray drive. iDeer Blu-ray Player can help you in this, you can download the latest version, which is well compatible to Mac OS X... Have a try！