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Put your original system installation disks into the DVD drive on your mac. When you boot into OSX, you will be prompted to do something (if you aren't just double click on the disk when it shows up on your desktop.) Tell it you would like to to a clean install and it will wipe your hard drive and when everything is over, you will have a brand new(like) computer. <br />
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Here is the apple support tutorial about how to do this: <a href="http://docs.info.apple.com/article.html?path=Mac/10.5/en/8177.html" rel="ugc nofollow">http://docs.info.apple.com/article.html?path=Mac/10.5/en/8177.html</a><br />
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Good Luck 
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Put your original system installation disks into the DVD drive on your mac. When you boot into OSX, you will be prompted to do something (if you aren't just double click on the disk when it shows up on your desktop.) Tell it you would like to to a clean install and it will wipe your hard drive and when everything is over, you will have a brand new(like) computer.

Here is the apple support tutorial about how to do this: http://docs.info.apple.com/article.html?path=Mac/10.5/en/8177.html [http://docs.info.apple.com/article.html?path=Mac/10.5/en/8177.html]

Good Luck

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our mac desktop some of problem inside , i want restore default os , please advice how can do this. 
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our mac desktop some of problem inside , i want restore default os , please advice how can do this. 

Restore default MAC OS X

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.