Remove Apple ID and upgrade older iMac
Need to know how to use an older iMac's monitor as a second one for my Mac Studio.
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As remove AppleID and upgrade older iMac:
To remove an Apple ID and upgrade an older iMac, sign out via System Settings/Preferences, install official OS updates, and replace slow mechanical hard drives with an SSD. [1, 2, 3, 4]
Removing an Apple ID
- Open System Settings (or System Preferences on older macOS) from the Apple menu.
- Click your name or Apple Account / Apple ID at the top of the window.
- Scroll down and click Sign Out.
- Choose whether to keep a local copy of your data, then enter your Apple ID password to turn off Find My Mac and clear activation locks.
Upgrading Software and Hardware
- Official Software Updates: Go to the Apple menu > System Settings (or System Preferences) > General > Software Update to install the highest version officially supported by Apple for your specific iMac model.
- Storage and Memory: Speed up performance drastically by swapping an old internal hard drive for a solid-state drive (SSD), and add more RAM if your specific iMac model allows memory modules to be replaced.
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As for Need to know how to use an older iMac's monitor as a second one for my Mac Studio.
You need to get Thunderbolt or FireWire(depend on your iMac has) to USB-3 adapter for Target Display Mode, though it could not work, since Target Display Mode is old technology.
