I have a 2011 Mac Mini (one of those $519 Christmas re-furbs) that I'm trying to run two screens on in my home theater. One screen is a 23" Sceptre at 1080p using HDMI and the Thunderbolt to HDMI adapter from Monoprice. The other screen is my Mits HC4000 projector which is connected through my Yamaha RX-A700 to the HDMI port on the Mini. I'd like to mirror the displays which seems to work fine running 720p but when I switch to 1080p I lose the picture on the projector. Anyone running a similar set up or have any advice?
I sort of had this working but could not get full 1080p from the Sceptre because all I had was a Thunderbolt to VGA (which I don't think would allow the full 1080p) But I could get 1080 out of the projector. Now I get 1080 from the monitor and no picture from the projector.
When I first plugged in my 1080p PJ, the Mini tried to connect with 1080p50, and they couldn't connect. I had to choose a 1080p60 setting in the Mac to get it to work. Solid ever since. Maybe try setting up as non-mirrored at first so you can see what is happening on the small monitor to get it working, then switch to mirrored.
Beware that beyond HDMI, you may also have HDCP issues, especially with a 3rd partner (Yamaha AVR) in the path.
I would first check that both your displays work fine at the same 1080p@60Hz resolution when DIRECTLY connected (Yamaha bypassed) on their respective outputs (Thunderbolt, HDMI), while keeping all adapters in the path.
If it works, the problem comes from the Yamaha.
I would then experiment on the order you power-on the Mini/Yamaha/Sceptre/Mits since this will affect the proper HDCP/EDID handshaking.
Powering first the Yamaha, then the Mini, then the Displays may be a good idea.
Depending on the result of those experiments, if it is EDID related, something like Gefen HDMI Detective Plus may help.