Starting up a mac with the restore disc?

I want to repair the the startup disc but they said I need to start the computer up with the restore disc? How do I do this? Thanks.

Hold the mouse button down while rebooting to open the cd tray if need be.
Hold c while the disk is in the Mac to boot from the installer disk.
Select Disk Utility from the installer menu and Repair Disk if you need to do that.
If you have a new Mac and want to run the Apple Hardware Test, option boot from the same cd instead.
As you know AHT updates with changes to Mac OS X, so the copy on the write only disk doesn't get updated. So don't totally freak if you get a error, it might be the firmware is changed. (on the Dual 2 you will too, I know )

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