How to enable AirPlay on iMac?

Nothing in Console.app that could be related ?. Apple Hardware Test reports no problems ?.

Unfortunately, these things can be hard to track down unless there's common(ish) solutions out there, or some clue in logs.

A test in another User Account seems unlikely to work, but it's quick & easy.

Even though Airplay won't work in Safe Mode , it does remove some caches, and again, takes little time.

After that : I'd reinstall via Recovery, which shouldn't normally affect your existing apps & data (have backups anyway). It's a long wait if sitting there watching, but left overnight, or even lunchtime, is perfectly reasonable.

Another option would be to install High Sierra to a suitable external drive, then start the iMac from it; just to prove that the hardware does what's expected without any interference from apps or settings.

You may be able to start the MBP in Target Disk Mode, and start the iMac from that, but Apple don't seem to push it now, except for data transfer. I don't know if they ever did, TBH, but it used to work perfectly well, even between different models, for me.

It's not so correct.

I've got a macbook pro early 2009 and I can airplay with X-mirror.

My old iPhone was able to connect through airplay too until

an update to ios 7 (I think but not so sure) without any further app

or hardware. Apple has in evidence cut off this opportunity

for marketing reasons, but with x-mirage you can airplay.

Cheers

Duet, or other 3rd party software on the iMac ?

airplay doesn't mirroring

Is your iMac connected to same Wifi network as your AppleTV? How strong is the wireless signal?

The point was only that other users have said that some 3rd party software affected Airplay working as expected.

Do you by any chance get a blank screen when you try to connect to Apple TV? We are having the same problem. MacBook connects fine, brand new iMac will not connect.

You can't. Airplay is not supported older than 2011. I'm also on an iMac Mid 2010. O'boy have I tried. Doesn't even work with AirParrot which is SUPPOSED to work.

Crap.