• Mac OS Leopard 10.5 is the sixth release by Mac OS for Apple’s desktop and server operating system for Macintosh computers. It is available in two editions: for desktop or personal computers and server version (Mac OS X Server). The retail price for the desktop version is $129 and $499 for the server version. It was released on October 26, 2007.
• Press Options - Command - R to upgrade to the latest version of macOS that's compatible with your Mac. Press Shift - Option - Command - R to install the version of macOS that came with your Mac, or the version closest to it that's still available. How to check your startup disk with Disk Utility in macOS Recovery mode.
• Dec 21, 2020 Other issues – There could be numerous other issues with your Mac as well that would demand a reinstallation. For instance, if your system has been upgraded to a corrupt macOS version or the update was halted in between, then you need to reinstall OS X.

• There's No Going Back (ld34 Version) Mac Os Update
• There's No Going Back (ld34 Version) Mac Os 8

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.

Sidecar was introduced a couple of months back which you can use to turn your iPad into a display that mirrors your Mac desktop. However, this new feature isn’t working for some on macOS Big Sur.

And as a result, there have been plenty of complaints about it on the official Big Sur forums.

Same issue. On macOS Big Sur 11.0.1 and trying to connect to an iPad Pro 12.9 (3rd generation). This was working for me in Catalina through AirPlay before I updated, but now it won’t work wired or wireless.
Source

Mine is not working with Big Sur, too. It used to work perfectly with Catalina. Apple only presents simple instructions and no fixes! Frustrating!
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As apparent from the above complaints, attempting a connection through “System Preferences > Sidecar > Connect to” does not work as the iPad fails to show up on the list of devices.

Users report that this issue began only with the Big Sur update and was non-existent previously on macOS Catalina.

Moreover, the mode of connection does not seem to matter as users report that they face the issue both when connected wired or wirelessly.

What to do if Sidecar is not working on macOS Big Sur

Fortunately, there is a couple of things you can try that have done the job for several users and may work for you as well.

If you’re trying to use your iPad as a 2nd monitor with a MacBook and Sidecar, sign out of iCloud on your iPad and sign back in. You’ll receive prompts on your Apple devices to confirm the sign-in on the iPad. Afterwards, go to your MacBook where you should see a notification badge on your System Preferences. Click into Apple ID where you’ll be prompted to enter your iPad passcode as well as your MacBook password. Once everything goes through, you should be able to go back to Sidecar in System Preferences and see your device as an option.
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Or in short, just sign out of iCloud on your iPad, then sign back in.

There's No Going Back (ld34 Version) Mac Os Update

Hopefully, the above workaround fixed the Sidecar not working issue on macOS Big Sur for you. We also hope that Apple will address the matter soon.

There's No Going Back (ld34 Version) Mac Os 8

For now, be sure to check out our dedicated macOS Big Sur update bugs/issues tracker for further coverage on issues like these.

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