Assessing Your Mac
Key to being able to troubleshoot and solve problems that you can't prevent is to be able to accurately and precisely assess how your Mac is performing and to know the specific configuration of your system. Mac OS X offers many more diagnostic tools than previous versions of the OS; however, several of these tools are quite complicated. Still, even if you might not be able to interpret all of their output, people who are trying to help might be able to, so even in this case it is useful for you to know how to use them. You should understand how to use these tools before you need them.
NOTE
If you choose Apple menu, About This Mac, you will see a window displaying the version of Mac OS X you are running, the amount of RAM installed ...
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