HT201276: Force an app to close on your Mac
Learn about Force an app to close on your Mac
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Helpful answers
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May 4, 2016 9:22 PM in response to cdanjby Carolyn Samit,If you don't want to post an EtreCheck report, since the Mac is slow to startup, remove all login items in System Preferences > Users & Groups > Login Items then restart to test.
Do the same for /Library/StartupItems
Login items can often be the culprit when a Mac is slow to boot.
And since this is a 2009 iMac, it wouldn't hurt to check the startup disk.
Launch Disk Utility located in HD > Applications > Utilities
Select the startup disk on the left then the left then select the First Aid tab then click: Verify Disk
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May 5, 2016 5:55 AM in response to cdanjby Linc Davis,Please take each of the following steps that you haven't already tried. Test after each one. Back up all data before making any changes.
1. Set the default startup disk.
2. Disconnect all wired peripherals except those needed to start up. If there's no change, reconnect them
3. Reset the System Management Controller.
4. Reset the PRAM. Afterwards you'll need to repeat Step 1.