Repair my HD using disk utility, please help!

hi, i performed a "verify disk" in disk utility on my "MACINTOSH HD" and apparently "1 HFS volume needs to be repaired" however, the "repair disk" button is greyed out, how can i fix this HFS volume????
also if someone could tell me what a HFS volume is and if it is important, that would be great!
Thanks!

> however, the "repair disk" button is greyed out, how can i fix this HFS volume????
You need to restart using the system CD/DVD and run Disk Utility from there.
1. Insert system CD/DVD into your PowerBook's optical drive
2. Restart
3. Press, and keep pressed, the 'C' key after you hear the startup chime
4. Release the 'C' key when you see that the PB has restarted into OS X displaying a multilingual selection window
5. Click through to the 'Installer' screen
6. From the 'Utilities' menu, select 'Disk Utility'
7. Select your PB's disk from the left hand panel
8. Ensure the 'First Aid' tab on the main, right hand, panel is selected
9. Click on 'Repair Disk'
NB. The "HFS volume" should be your PB's internal drive - and yes it is important (without it you have no drive).
15 1.25G/12 1G PBs, Mac minis, iBooks G3/G4,   Mac OS X (10.4.3)   Cube, TAMs, iPods 2G/4G, iPs, AEBS, AX

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