Audio passed through to TV

Hello,
I'm new to this forum, my apologies if this question is already posted before.
I just bought a Mac Mini today, it is attached to my Onkyo receiver through HDMI. When I look at the output settings of my audio I can only choose for internal speakers or Panasonic TV (HDMI). I can't select my Onkyo receiver, so I don't haver my 5.1 stereo sound at this moment.
Is this a know issue or does anybody have a solution for this?
Thanks in advance !!
Brian from the Netherlands

Regrettably, some receivers have compatibility issues with some (or all) computers.
It's likely that there is no "fix" for your situation. But one thing you could try is zapping the pram (restart and immediately hold down four keys until the computer chimes 3 times: Apple Option P R )
If the problem is in your Mac, this should resolve it. But, as I said, the problem could be in the receiver.
If that doesn't work, you'll have to switch to using an optical digital audio connection to the receiver. This requires a mini-Toslink cable, which plugs into the headphone jack.

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