14. Sign out of iMessage. Another place you’ll need to log out is in the Messages app. Here’s how:

• Open the Messages app.
• Click the Messages menu and select Preferences.
• Click iMessage and select Sign Out.

15. Determine your Mac’s processor type. The steps to reformat your Mac will be different depending on whether you have an Apple silicon or Intel processor. Here’s how you can check:

• Click the Apple menu and select About this Mac.
• Check for a line that begins with “Chip” and ends with a chip name, like Apple M1. If you see this, you have an Apple silicon processor.
• If you don’t see a “Chip” line, but do see a line beginning with “Processor” that includes an Intel processor name, you have an Intel processor.
  

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16. Shut down your Mac. Since you’ll need to boot into recovery mode, you’ll want to start with a shut-down computer. Click the Apple menu and select Shut Down now.

17. Boot into recovery mode. Follow the steps for your processor type:

• Apple silicone: Press and hold the Power button until you see a hard drive with a gear. Click the gear, select Continue, and then sign in with your Apple ID if prompted.
• Intel: Press the Power button once, and then press and hold the Command + R keys until you see the Apple logo. If you’re prompted to sign in, follow the on-screen instructions to do so.