Using 2011 iMac as display monitor with Macbook Pro 2022

Hello trunguyen94,

It seems like you're wanting to use your iMac as a display with target display mode, is that correct? If so, please check out the following link, and ensure all of the requirements there have been met, so we can make sure there aren't any issues: Use your iMac as a display with target display mode

For issues using target display mode, please check out the information and suggestions from the above link, which may help:

If target display mode doesn't work

If your iMac doesn't show the desktop of your other Mac, try these steps first:

1. Restart your iMac.

2. Restart the other Mac.

3. Unplug the Thunderbolt or Mini DisplayPort cable from the other Mac, then plug it back in.

4. Press Command-F2 on the iMac.

If that doesn't work, try these other solutions:

• If you're currently logged in to the iMac that you want to use as a display, choose Apple menu  > Log Out to return to the login window. Then press Command-F2 again.

• Choose Apple menu  > System Preferences, then click Keyboard. If ”Use F1, F2, etc. keys as standard function keys” is selected, target display mode uses Command-Fn-F2 instead of Command-F2. It might also help to use the keyboard that came with your iMac. Some third-party keyboards and older Apple keyboards don't support target display mode. 

• Make sure that your iMac is using macOS High Sierra 10.13.6 or earlier. You can't use target display mode with later versions of macOS, or with Boot Camp and Windows.

Thanks!