Why is not possible to upgrade to Sierra?

My original Mac Pro OS was Mavericks or Mountain Lion.  Mac Pro is end of 2013 current version, 12 GB memory, Yosemite (10.10.5) with Windows XP (SP3) within the 10 version of Parallels.  At Yosemite's original operating system upgrade went well.  A year earlier, when you try to upgrade to El Capitan, download and installation is complete but resulting Mac Pro has been completely non-functional.  Technical assistance from Apple then able to help access Time Machine and restore it on a working machine.  Apple technology has theorized that the problem may have been caused by the Norton Antivirus program running in the Apple environment (which was then deleted).  Two days ago tried to upgrade OS Yosemite Sierra.  Similar result as we have.  Power on the Mac Pro seems to be running with Sierra.  In configuration iCloud and other applications, the environment has hung up and the machine had to be restarted.  Turned on, the Apple logo appears along with the sound chime.  Nothing else.  Same sequence repeated constantly.  Apple support was able to help (with some difficulty - keyboard randomly not responding) to get pressure on power-up/alt keys to work and generate a recovery screen.  Backup Recovery Time machine produces a work, an original machine of Yosemite.  Question - what needs to be done to have a Mac Pro expandable to Sierra?

First of all, you must make sure that all applications and hardware drivers are

up-to-date and compatible with macOS Sierra.

If you run any Antivirus application, applications assistance, speed up the apps, haxies,

cleaner for apps, or anything else that claims to improve performance, remove them

by directions of app developers.

If you do, download and run Etrecheck (http://www.etrecheck.com/).  It's a

application developed by one of the contributors here and can give us additional info

about what can be potential problems.

In addition, if you encounter any problems at all now, no matter the size, they get usually

greatly amplified with any upgrade of the OS.

Tags: Mac OS & System Software

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