Maybe you've just upgraded your memory or RAM, or you just want to test your hardware like your video card. Your Mac comes with two DVDs, which is in this case the installer and the Apple Hardware Test DVD.
Basically, you just insert the DVD and press 'D' key before the gray screen appears. It will boot the DVD and run Apple Hardware Test utility.
For more information, just click this Apple's Support website link: http://support.apple.com/kb/HT1509.
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