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I will need some information before we begin:
Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information:
Reboot into the Recovery HD by choosing the ‘Apple‘ menu > Restart, then hold down the ‘Command’ + R’ keys on the keyboard during the start up process. When you see the Apple Logo you can let go.
When the machine boots you may have to choose your language then you will see the OS X Utilities screen. Select the Disk Utility and then select Continue. Then in Disk Utility select Macintosh HD in the left column (if there are two with that name or it is named something else choose the first indented item) select the First Aid tab if it is not already selected, then click on Verify Disk on the far right. If that says “OK” in green type then select Repair Disk Permissions. If it is not ok let me know.
Once you check that I will give you instructions to remote connect
If that is ok let me know...
Using the computer that has the issue, click on the link below and when the webpage opens click on Join your Session, then select Download and allow the app to run. If you get a message saying "identity cannot be confirmed” or “Your security preferences allow installation of only apps from the Mac App Store and identified developers” go to System Preferences / Security & Privacy / select the General tab and at the bottom click on Open Anyway, then look for my messages on your screen: http://mikethemacmedic.com:8040/?Session=7efa2205-57f6-40ef-aaa0-d730a80e8e9b
Wait for it to finish then restart the computer and follow the directions