Target Display Mode

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Target Display Mode

I have been using my old iMac (2013) as a monitor for my MacBook pro for almost a year. Yesterday it stopped making the connection when I pressed command, F2. I have restarted, unplugged, and replugged using different ports with no luck. The only thing that changed yesterday was internet issues with Atlantic BB - a new modem and setting up with a "5g" network. I wouldn't think the internet would have anything to do with it not connecting in Target Display Mode..

One other note is that some keys have not been working on the iMac wireless keyboard (numbers 1,2,3,4,5,6 and m). I had to change my password using the keyboard viewer. I cannot tell if the f2 key happened to stop working - sure seems odd after this long.

Can anyone offer some help?

iMac 21.5″, macOS 10.13

Posted on Jun 30, 2021 7:04 PM

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Answer 1

Top-ranking reply

den.thed

Level 10

90,934 points

Jun 30, 2021 7:38 PM in response to BheamIsland

Startup in Safe Mode followed by a normal restart.

see > https://support.apple.com/en-us/HT201262

Then open your Keyboard Viewer and test the keys on your keyboard.

see > https://support.apple.com/guide/mac-help/use-the-keyboard-viewer-mchlp1015/10.13/mac/10.13

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Answer 2

den.thed

Level 10

90,934 points

Jun 30, 2021 7:18 PM in response to BheamIsland

Keys and keyboards can fail with age and I would test another keyboard.

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Answer 3

den.thed

Level 10

90,934 points

Jun 30, 2021 8:19 PM in response to BheamIsland

You're welcome.

Last ditch effort, go to Apple > System Preferences > Keyboard > Shortcuts > click Restore Defaults and retest the keys.

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Answer 4

BheamIsland Author

Level 1

8 points

Jun 30, 2021 7:27 PM in response to den.thed

I will need to try to get one. It just seems like such an odd coincidence to happen after the internet issues.

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Answer 5

BheamIsland Author

Level 1

8 points

Jun 30, 2021 8:28 PM in response to den.thed

I tried that earlier. I guess I need to get a new (old) keyboard.

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Answer 6

BheamIsland Author

Level 1

8 points

Jun 30, 2021 8:06 PM in response to den.thed

Thanks.

I tried your suggestion and I can see which keys highlight when I press them and the number keys I mentioned and the letter m don't highlight. Unfortunately, the "f" keys don't highlight yet I know the volume is working. F2 does seem to have stopped controlling brightness so it just might be the keyboard.

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Target Display Mode

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