Old Apple ID not valid
My Apple ID is no longer valid and I have a new one. How do I remove old one from my MAC?
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What do you mean by not valid? If you can't sign out of the old Apple ID so that you can sign in with the new ID, do a backup, preferable 2 separate ones on 2 drives. Boot to the Recovery Volume (command - R on a restart). Run Disk Utility/First Aid. Reformat the drive using Disk Utility/Erase. Use Mac OS Extended (Journaled), then click the Option button, and select GUID. Quit Disk Utility, then re-install the OS.