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This usually happens if the system files are corrupted or if there is any issue with the hard drive partition. We can run Disk Utility and see if it works or not. Turn off your Mac by holding down Power button for 10 seconds. Then turn it back on and immediately hold down Command and R keys at same time for 20 seconds and this will boot your Mac to the Mac OS X Utilities screen. From there, click Disk Utility. Select your hard disk at left column(Macintosh HD or hard disk name). Then click Verify Disk (under First Aid). If asked to repair, click Repair Disk. Then click Repair Permission.
Then restart from Apple menu. If that didn't work, then turn it off. Turn it back on and immediately hold down Command, Option, P and R keys at the same time for 5 seconds, then release the keys and immediately hold down Shift key for 20 seconds. Does it boot into desktop and are you able to open apps now ?
Please let me know if that didn't work, so we can continue troubleshooting.
The above steps will not delete any files from your Mac. But if the system files are really corrupted, then it may make the Mac not to boot again until we reinstall the OS X. So it is better to backup all your important files an external hard drive before do any troubleshooting
You don't need to have any application to open to actually backup your files. In Finder, go to Home folder and open Pictures folder. You will see your iPhoto or Photos Library there. Copy it to your external hard drive.
Also back up your iTunes Library same way (from Home folder).
If it is freezing frequently, then it is possible that the hard drive is failing. You should keep trying to backup your files ASAP. Don't restart your Mac until you backup all your files. Backup small files like documents and stuffs first, then backup large files like iPhoto Library or iTunes Library.
And do not try the previous troubleshooting steps until you backup all your files
If it is not allowing to backup the entire library at a time, then lets try to backup the photos individually. Go to your Pictures folder. Then right click or control click on your iPhoto or Photos Library and select Show Package Contents. This will open the contents in Finder. You will see Masters or Originals folder there. This folder contains all your photos. Open this folder and you will see multiple folders with years.
Backup one folder at a time in there. This may allow you to backup without giving much stress on hard disk
Hi there, Sorry for the delayed response. Had to go offline since it was very late in here. Can you try the suggestions I sent you ?
Yes, it may take a while to scan the hard drive and if Repair is needed, it will ask you to repair it
If you see the Verify Disk button lit up again, that means it is finished. Also, when it is finishes, you will not see any progress bar. So it is probably finished. So restart and try the other steps
Go ahead and try to backup all your files. Once you backup your files, we can do the troubleshooting without any worries
Teyit in another USB port. If that didn't work then restart normally
No easy way. Can you try to backup entire library ow ?
It seems my answer didn't post here. So I'm posting again.
Running Disk Utility won't delete anything. You can search the missing files on Spotlight (search at top right). Also, check the Trash for the missing files.
Also, go to Pictures folder and then backup your entire iPhoto Library now to external hard drive or flash drive. Let me know once your important files are backed up, so we can do further troubleshooting.