The first release of the new OS — Mac OS X Server 1.0 — used a modified version of the Mac OS GUI, but all client versions starting with Mac OS X Developer Preview 3 used a new theme known as Aqua. Aqua was a substantial departure from the Mac OS 9 interface, which had evolved with little change from that of the original Macintosh operating. Restart your Mac. Hold down Command + R until the Apple logo appears. When the options appear on screen, choose 'Restore From Time Machine Backup' and click Continue. The next screen will show the. Mac OS X launched on March 24, 2001. The 1990s were rough for Apple. Until 1997, when Steve Jobs took the helm again, the company attempted to right itself by creating a plethora of CE products. Back in 2004, I bought an iMac G5 (still PowerPC back then), because I was so sick and tired of Microsoft frigging Windows. Two weeks OS X (Panther, back then and Tiger now) and I wondered how on earth I had been able to tolerate MS Windows for all those years (answer: I didn't know any better). I now have Ubuntu on my PC.

Actually I have no idea what else to do, but it took weeks trying to learn mac osx is crazy. Django nginx operating-system gunicorn supervisord. Improve this question. Why are all the MOSFET drains connected together and to nowhere else?

Start up from macOS Recovery

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labelled Options, then click Continue.

Intel processor

Make sure your Mac is connected to the Internet. Then turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

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If you're asked to select a user you know the password for, select the user, click Next and enter their administrator password.

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Reinstall macOS

Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

Mac

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  • If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
  • If the installer can't see your disk or notifies you that it can't install macOS on your computer or volume, you may need to erase your disk first.
  • If the installer offers you the choice between installing on Macintosh HD or Macintosh HD – Data, choose Macintosh HD.
  • Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac may restart and show a progress bar several times, and the screen may be empty for minutes at a time.

When the installation is complete, your Mac may restart to a setup assistant. If you're selling, trading in or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete the setup process.

Other macOS installation options

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When you install macOS from Recovery, you get the current version of the most recently installed macOS, with some exceptions:

  • On an Intel-based Mac: if you use Shift-Option-Command-R during startup, you'll be offered the macOS that came with your Mac, or the closest version that is still available. If you use Option-Command-R during startup, in most cases you'll be offered the latest macOS that is compatible with your Mac. Otherwise you'll be offered the macOS that came with your Mac, or the closest version that is still available.
  • If the Mac logic board was just replaced, you may only be offered the latest macOS that is compatible with your Mac. If you've just erased your entire startup disk, you may only be offered the macOS that came with your Mac, or the closest version that is still available.

You can also use these methods to install macOS, if the macOS is compatible with your Mac:

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  • Use the App Store to download and install the latest macOS.
  • Use the App Store or a web browser to download and install an earlier macOS.
  • Use a USB flash drive or other secondary volume to create a bootable installer.