upgrade to el capitan, now error message at first upward...

last night I clicked on free upgrade to el capitan on the itunes site... download for a long time, then when done... the system restarts and I get the following error message

and it does not start... Please help...

If you do not already have a current backup, please backup all data, and then reinstall the OS. * you don't need to erase the boot volume, and you won't need the backup unless something is wrong. If the system has been upgraded an earlier version of Mac OS X, you may need to the Apple ID and password to use.

There are ways to back up a computer that is not fully functional. Ask if you need advice.

If you installed the runtime Java distributed by Apple, and still need, you will need to reinstall it. It goes the same for Xcode. All other data will be preserved.

Related support article refers to OS X 10.11 ("El Capitan"), but the procedure is the same for OS X 10.7 ("Lion") and later versions.

Tags: Mac OS & System Software

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