Shuttle XPC barebones have their own motherboard designs and are a neglected brand when it comes to Hackintosh support. During the time circa Snow Leopard, I tried and failed to get OS X working to my satisfaction on a Shuttle SG33G5M. If I remember correctly, I may have been able to boot into OS X, but could not get hardware graphics acceleration support.
Fast forward to 2015 with OS X Yosemite, Unibeast and Multibeast and it seems we now have a working combination to get a Hackintosh on a Shuttle XPC !
In preparation, we should first have some idea of the hardware components of the Shuttle SG33G5M/Deluxe:
* Intel G33 chipset – ICH9 series Southbridge
Rather than fiddle endlessly trying to get the onboard Wi-fi to work, I bought a low-cost TP-Link WN-723N Ver 3.0 dongle and used the driver provided here: http://www.hackintoshosx.com/files/file/4331-tp-link-tl-wn723n-v3-tl-wn725n-v2-usb-wifi/
Tip: If the Wifi Connection Utility doesn’t show up, try removing the dongle and reinserting it again.