While booting Mac OS you might encounter number of problems like warning signs and prohibitory sign on Mac is amiongst one of them. This prohibitory sign is a sign of trouble and indicates that something is has gone wrong with bootable installations of OS. Macbook prohibitory sign on startup may encounter because the settings between the hardware and software components are not valid or because the system files might be missing of your system or has been moved, replaced, or damaged. This situation can lead to data loss then for the data recovery you need a macbook data recovery software program.
If your Mac OS X has multi boot configuration then it your Mac system is much prone to this very problem. For the complete access to file system of another Mac OS X installation, when booted in one installation it might lead to changes of important system files. However in some cases you may not face this issue if you are running Boot Camp since Windows cannot access HFS+ file system volume by default.
In order to solve out the issue of prohibitory sign on mac startup you can try out below listed steps:
Firstly you need to reset your PRAM. Next hold the Options+Command+P+R keys after pressing the power button and system will reset continually and boot chimes. Release the keys and let the cycle be completed.
Repair the hard drive. Boot your system using Mac OS X boot DVD and then run file system check and the permission fixes on boot drive.
Perform erase and install installation by using Mac OS X boot DVD. It will replace all your system files and data structures which have been damaged. When the process comes to an end then you can restore your lost data with the recent backup. If you don't have any backup then need not to worry about that you can easily recover your lost macbook data.
After carrying out the above listed process you will surely fix your problem of Macbook prohibitory sign on startup. However if you do not have any recent backup then you do need to worry about that as with the macbook data recovery software program you can easily recover your lost macbook data. It powerfully scans your whole Mac hard drive and extracts all missing or inaccessible data. It is the most excellent solution for all mac data loss situations.
Processor: Intel Power PC (G4 or later)
Operating System: OS X 10.6 Snow Leopard, 10.5 Leopard, 10.4 Tiger, and 10.3.9 Panther
Memory: 256 MB
Hard Disk: 40Mb