How do you restart the computer from the installationn disk

Hello,
After the disk doctor utility told me to
2010-09-19 08:36:49 -0700: Disk Utility stopped verifying “Macintosh HD”: This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X installation disc), and then use Disk Utility to repair this disk.
2010-09-19 08:36:49 -0700:
I can't find anywhere that explains how to do this. Can you help me?
Pat

Hi patocsj,
Welcome to the forum.
Just to explain further, one cannot 'Repair' a volume that one started up from. You need to start from a different volume.
So, to expand further on Murat's advice do the following:
1. Start from your Mac OS X Install disc: Insert the installation disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.) Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
The above was copied from the following Apple KB document:
http://support.apple.com/kb/ts1417
Da Vinci

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