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Mac mini (Early 2009) - Technical Specifications
https://support.apple.com/kb/SP505
One FireWire 800 port (8 watts); five USB 2.0 ports (up to 480 Mbps); mini-DVI output; VGA output (using optional adapter); Mini DisplayPort: Audio: Built-in speaker, combined optical digital audio input/audio line in, combined optical digital audio output/headphone out: Networking: Built-in 10/100/1000BASE-T (Gigabit) Wireless
Audio output from Mac mini 2009 - Apple Community
https://discussions.apple.com/thread/2738222
There are two 2009 Mac mini models, Early 2009 and Late 2009. I can tell you for sure that the Early '09 Mac mini does not have integrated audio from the mini-DIsplayPort. It was my understanding that the Late '09 Mac minis built in 2009 also did not have integrated audio, but those made in early 2010 did.
Mac mini (Early 2009) - Macworld
https://www.macworld.com/article/195473/mac-mini-2009.html
Mac mini (Early 2009) By Dan Frakes. ... The latter port works directly with Mini DisplayPort-equipped displays such as Apple’s current …
Mac mini "Core 2 Duo" 2.0 (Early 2009) Specs (Early 2009 ...
https://everymac.com/systems/apple/mac_mini/specs/mac-mini-core-2-duo-2.0-early-2009-nvidia-specs.html
Connectivity includes Mini-DVI and Mini DisplayPort, a Firewire "800" port, five USB 2.0 ports, combined "optical digital audio input/audio line in" and combined "optical digital audio output/headphone" minijacks, a 10/100/1000Base-T Gigabit Ethernet port, and built-in AirPort Extreme (802.11a/b/g/n) and Bluetooth 2.1+EDR.
Mac Mini March 2009 - Mini Display Port Audio? | MacRumors ...
https://forums.macrumors.com/threads/mac-mini-march-2009-mini-display-port-audio.991847/
Everything my research discovered is that the early and late 2009 mini's don't support audio over mini display port. I even tried it with no …
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