You may encounter a number of warning signs that occur while booting Mac OS X, and “prohibitory” sign is a common one among them. It indicates that something is wrong with the bootable installation of the operating system. Either the settings between hardware and software components are not valid, or some critical data structures/system files of your Macintosh machine are missing. Such situations can cause severe data loss problems with you Mac OS X computer. At this point, Mac Recovery becomes essential if there is no valid backup available.
Your Mac OS X system is more prone to this problem, if it has multi-boot configuration. You can get complete access to file system of another Mac OS X installation, when booted in one installation, that may cause inadvertent changes of critical system files. In most cases, you may not face this behavior if you are running Boot Camp as Windows cannot access HFS+ file system volume by default. However, you can get full access of HFS partitions from Windows by installing third-party applications.
How to Fix Prohibitory Sign in Mac OS X?
You can try out the below steps to sort out this issue; but you need to reinstall the operating system if system files are missing or damaged:
• Reset PRAM (Parallel Random Access Memory): Hold Options+Command+P+R keys just after pressing power button and system resets continually and boot chimes. Let this cycle complete few times and release keys.
• Repair the Hard Drive: Try booting your system using Mac OS X boot DVD and run file system check and the permission fixes on boot drive.
• Perform Erase and Install Installation: Use this option as a last resort only as it removes all the data from hard drive and cause serious data loss. You can do this using boot DVD of Mac OS X operating system. It replaces all damaged system files and data structures. After completion of reinstall process, restore data from the most recent backup.
However, if the backup is not in place, File recovery mac is the safest and simplest way to get your precious data back.
Mac Data Recovery is possible through the powerful third-party applications, known as Mac Recovery Software. The applications are powerful enough to thoroughly scan whole Mac hard drive and extract all lost, missing, and inaccessible data from all data loss situations. They retrieve your files, folders, and hard drive volumes in an easy, safe, and quick way.
Stellar Phoenix Macintosh Data Recovery is the most excellent solution for all Mac data loss scenarios. It supports recovery of lost Mac data from HFS, HFS+, HFSX, HFS Wrapper, and FAT file system volumes. The software is usable with Mac OS X 10.6 Snow Leopard, 10.5 Leopard, 10.4 Tiger, and 10.3.0 Panther.
How to Fix Prohibitory Sign In Mac OS X At Startup