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Helpful answers
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May 26, 2016 2:10 PM in response to haztastic1by Linc Davis,If you don't already have a current backup, please back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.
*The linked support article refers to OS X 10.11 ("El Capitan"), but the procedure is the same for OS X 10.7 ("Lion") and later.
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May 26, 2016 2:16 PM in response to haztastic1by theratter,Check this for a current driver for the model: Printer & scanner software available for download for your Mac. Also, see if this doesn't help: Printers not behaving? Reset them and start from scratch | MacIssues. Visit the Canon website for printer support and check if there is a newer driver for that model than the one she now uses.