新 iMac 可以成為一個 External Display
根據 Apple 網站的文章， iMac (27-inch, Mid 2010) or iMac (27-inch, Late 2009) 型號可以作為外置顯示器，方法簡單：To use an iMac (27-inch, Mid 2010) or iMac (27-inch, Late 2009) in Target Display mode with another computer as the source:
[*]Make sure both computers are turned on and awake.
[*]Connect a male-to-male Mini DisplayPort cable to the Mini DisplayPort on each computer. The 27-inch iMac will enter Target Display mode and display content from the source computer.
Note: If you are connecting two 27-inch iMacs, connect a Mini DisplayPort cable to each computer and press Command + F2 on the 27-inch iMac keyboard that you will use as an external display.
[*]To leave Target Display mode, press Command + F2 on the keyboard of the 27-inch iMac that is in Target Display mode. To return to Target Display mode, press Command + F2 again.
source: http://support.apple.com/kb/ht3924
大家可以放心買27”型號，唔怕將來outdate無 upgrade了，起碼可以當一個external display嘛！
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