I have a 2008 iMac, what is the easiest way to use it as a monitor for a Mac mini

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The 2008 will not work as a display.

A new Mac mini does not support using any iMac.

However you can use most any aftermarket display with the Mac mini's.

see > Connect a display to Mac mini - Apple Support

booupdates wrote:

I would like to use my 2008 iMac as a monitor for the Mac mini....

Once again, the 2008 iMac cannot be used as a display, period. There are no software hacks, tweaks, or magic wands to make it work as a stand alone display. It does not matter what you are trying to connect it to. It simply cannot be used as a display!

The easiest way is to get a new display as:

1. The 2008 iMac never supported being used as a display
2. No Mac manufactured since 2020 onward cannot use any iMac as a display.

booupdates Said:

"I have a 2008 iMac, what is the easiest way to use it as a monitor for a Mac mini: I have a 2008 IMac and would like to use it as a monitor for my Mac min. What is the easiest way to do this?"

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Target Disk Mode:

No. Target Disk Mode is what was always able to be used. You cannot use it on a M1 Mac, nor Catalina and after. Go here: Use your iMac as a Display with Target Display Mode - Apple Support