How to Restore Factory Settings on a Mac?

How to Restore Factory Settings on a Mac OS X 10.6.8?
I have been told you can do this without the Installation CD. I also do not remember the installation CD when i got the laptop. If it's possible then please someone let me know! if not then how can i get a new CD to do this?
my computer keeps freezing on me at random times, and i have tried taking the laptop to my college tech support and also Best Buy and they said they can't do anything and that i need to try resetting the mac.

You may not remember the installer disks but they came in the box. Your profile shows you are running 10.6.6 Snow Leopard. To restore back to factory settings you need those disks. That said to go that route may be unnecessry. Stay away from Best Buy tech people. They know nothing. Without the disks you do a repair disk to see if that helps:
Start up your computer in single-user mode to reach the command line.
Note: If necessary, perform a forced restart as described in the Emergency Troubleshooting Handbook that came with your computer. On desktop computers, you can do this by pressing the reset/interrupt button (if there is one) or holding down the power button for several seconds. On portable computers, simultaneously press the Command-Control-power keys. If your portable computer doesn't restart with this method, you may need to reset the Power Manager.
At the command-line prompt type:
/sbin/fsck -fy
Press Return. fsck will go through five "phases" and then return information about your disk's use and fragmentation. Once it finishes, it'll display this message if no issue is found:
** The volume (name_of_volume) appears to be OKIf fsck found issues and has altered, repaired, or fixed anything, it will display this message:
***** FILE SYSTEM WAS MODIFIED *****
Important: If this message appears, repeat the fsck command you typed in step 2 until fsck tells you that your volume appears to be OK (first-pass repairs may uncover additional issues, so this is a normal thing to do).
When fsck reports that your volume is OK, type reboot at the prompt and then press Return.
Your computer should start up normally and allow you to log in.

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