I wanted to use a mini display-port cable then use "target display mode" to make the iMac an external display, but I just read that early 2009 iMac's don't have target display mode as a feature.
Anybody knows of a solution?
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This cannot be done with your particular iMac (2009 20")
Per the Target Display Mode System Requirements Page it specifically says:
A supported iMac with OS X v10.6.1 or later.
The supported iMacs are:
- iMac (27-inch Late 2009)
- iMac (27-inch Mid 2010)
- iMac (Mid 2011)
- iMac (Mid 2012-Mid 2014)
However, there is an App that allows you to turn a spare Mac into an extended monitor. It's called Air Display. This is not my ideal solution as video intensive applications don't perform well with software solutions.
If you need a secondary monitor, you may have to get a dedicated monitor to meet your needs