I have both a MacBook Pro and macair but the pro won't let me in I think it something to do with hard disc or permissions as it says system profiler in utilities , if anyone could help I'd be very grateful

I have both a MacBook Pro and macair but the pro won't let me in I think it something to do with hard disc or permissions as it says system profiler in utilities , if anyone could help I'd be very grateful

Restart the MBP and immediately hold the option key down. Release the key when you see the Apple logo. The computer will boot and show you a screen with two hard drive icons.
Select Recovery and hit Return.
On the new screen, select Disk Utility and hit Return.
In DU do this:
In the list at the left, select the name of your hard drive. (Be sure to select the name that’s indented to the right in the list, not an item at the far left.)
Click First Aid.
If Disk Utility tells you the disk is about to fail, back it up and replace it. You can’t repair it.
Click Repair Disk.
When that is done, click Repair Permissions. Be patient!
When that is done, quit DU and restart in the usual way.

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