Secondary Screen
Is it possible to use a 2009 21.5” iMac as a secondary screen for a MacBook Air?
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Is it possible to use a 2009 21.5” iMac as a secondary screen for a MacBook Air?
No. It requires a Late 2009 27" iMac.
Use your iMac as a display with Target Display Mode - Apple Support
No. It requires a Late 2009 27" iMac.
Use your iMac as a display with Target Display Mode - Apple Support
Secondary Screen