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This happens to me all the time, if your computer is muted when it turns off it won't bong when you turn it back on (doesn't apply to restarts). A bit odd but it happens.


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Try System Prefs > User & Groups > Your name > Login Items. Select it in the list & click the - button underneath If it's not listed there, then check either /Library/LaunchDaemons/ or /Library/StartupItems/ to see whether it has an entry in there. It's safe to remove items from there - though they will continue running until the next reboot. If ...


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Vertical bars/strips are usually indicative of a display malfunction. If you are also having booting problems, it is more likely GPU failure. You should take the iMac to Apple soon as it likely requires servicing. To backup your iMac, connect an empty hard drive with enough storage to back up your iMac, then go to System Preferences > Time Machine. Turn ...


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If you're lucky, this is a common, and easily remedied iMac problem. Just tell me this: does your system come up in a usable state if you hold down the shift button while powering up? (That combination gets you into "safe mode".)


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There are 2 trouble shooting methods if the Safe mode fails. But before you go in to them, try the PRAM reset. Turn on your Mac. Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears. Continue holding the keys down until your Mac restarts, and you hear the startup sound ...


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The first thing I'd try is resetting the NVRAM: Shut down your Mac. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. Turn on your Mac. Press and hold the ⌘+Option+P+R keys immediately after you hear the startup sound. Hold these keys until the computer restarts and you hear the startup sound for a second time. Release the keys. ...


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It should work if you don't have FileVault and if you plan to install it on a partition (which you probably do). You can just hold alt/option and it should show Macintosh HD, Recovery HD, and Linux (or whatever you named it). You can cycle through with arrows and hit enter to confirm. If that doesn't work, you might just install rEFInd :(


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For OS X system files you cant not determine the end since it keeps working, but if you have start up apps you can do it for those. For the OS X you could use the first phase of boot process. it is indicated in the Console as bootlog[0]: BOOT_TIME 1428512373 0 After that the OSX is running mostly customization, like finding and connecting to your network ...


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The Dock should be ready to take commands (e.g. mouse-clicks) as soon as it shows. If you are keen to know what is going on at login, you could add Activity Monitor to your login items and monitor CPU and disk activity as well as "task build-up" (like seeing what tasks are popping in to the list). Another approach would be to kick off the start process of ...


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If your main partition is encrypted it will not be unlocked and mounted after booting to Recovery Mode. After starting Disk Utility you have to unlock the volume first. Then enter the FileVault2 password. The volume will be mounted automatically after entering the proper password. Now verify or repair your main volume.



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