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http://www.apple.com/mac-mini/
Mac Mini was created on 2011-07-20.
You cannot put a Mini Disc physically into a Mac. You can connect a Mini Disc player to the Mac and listen to it through some audio software.
No. The graphics "card" in a Mac mini is integrated into the motherboard. There are also no available expansion slots in a Mac mini.
You can see some photos of the inside of a Mac mini in the "Related Links" link below.
A Mac Mini is a computer. It can be used with any screen and keyboard.