Mac OS X and are very stable and reliable. However, if you want that your Mac is too perfect, you must maintain it properly to work. Most errors and incidents occur to cause your Mac to be due to incorrect permissions table. Mac OS X as a UNIX system UNIX has a way to manipulate the files contained. UNIX as a multi-user system provides access via a unique way of manipulating. (Learn more about file permissions, you can read here). If the new software is installed on your Mac and you have another system settings, it is very likely that permissions will clutter so that you can not run applications or it may happen that your Mac acting funny. The best way to set permissions is to use Mac OS X Disk Utility, located in Applications / Utilities.
Fixing permissions is recommended before and after installing any software on your Mac and installing a software update. There are various software that will help keep the Internet to your Mac, and maintained a “healthy”. Are programs like Onyx or Cocktail, has done an excellent job of repairing not only works and check the permissions for you, but also cleaning Internet history, cache, temporary files, and optimizing scripts.
If for any reason you are not able to boot your system before attempting to do something like that you reinstall the operating system, you Command + S at boot, and it will console you to obtain. Enter / sbin / fsck-fy and press Enter. Do this several times until it does not say “the system updated. Before fsck, I suggest you open Terminal, type fsck in people and read the instructions carefully. Not all software errors are so easy to solve by the methods described above. Some errors and crashed the system can indicate a serious hardware failure, so if problems persist, it is best to take your Mac to a service Apple Authorized Service Provider for a check-up.