Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Fixing System Problems without a Backup – I [Corrupted system files]
In this three-part series, we will discuss how to fix system problems like account lockouts, corrupt data and accidentally deleted files. Though backup might fix these problems, it is very time consuming and if the backup is not recent, it results in data loss.
Corrupted system files can come from a system crash. Mac installation disk has the ability to fix this system problem. So keep those disks safe to prevent any loss.
If you are working on Mac, it might be possible that instead of having corrupted files, you have actually broken file permission, or created any other file system issue. Most of such cases can be solved by rebooting the computer in Safe Mode.
When you boot in safe mode, the system will check for errors and delete cached files. It will then start in a basic functionality state that will not include the ‘extras’. Once the system reboots completely in the safe mode state, you can restart the computer again (in normal mode). This generally takes care of most errors.
In case the problem isn’t fixed, use the OS X installation disk. Run disk utility to repair the hard disk. It’s easy. Insert the disk in the drive and reboot the computer. Keep pressing the C key until it boots. When it boots and asks for language, select your preferred language and select Installer menu-> Disk utility. You will see a tab named First Aid. Look for your hard drive in that tab and expand it. Now select the right partition and click on repair. If everything is fine, you will see a message that your disk is repaired. If it shows that your system has corrupted files, you will have to follow a different path.
Reinstall the operating system as the final measure. This step will leave the personal files as they are and restore the system files.
Did you find this post useful? If your problem is still unresolved, just keep reading, the next post will be about logging in problems.
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