HT201541: Update the software on your Mac
Learn about Update the software on your Mac
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Helpful answers
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Mar 7, 2015 12:20 PM in response to ianfrombricket woodby my ginger,First try a pram reset. Command/Option/P/R keys for three chimes at startup. Then use single user mode to check and repair your disk. Are you running 10.6.8 or is it newer? Just in case you have to run disk repair, you would need the install disk or boot to recovery, to use disk utilities. Or do a reinstall.https://support.apple.com/en-us/HT203176