Need 10 minutes to power on iMac, why?

Dear friends,
My 4-month-old iMAC met a problem today. In the morning, when I turned on the computer by pushing the power button, it took 10 minutes to start the computer: When I push the button I can hear a little sound from the inside. Then, nothing happen in the screen, and no sound can be heard anymore. However after about 10 minutes waiting, the computer start normally. When it began starting, it only took about 1 minute. After this I can use the computer normally and do everything I want. I have repeated this process 5 times. Each time, the waiting period is among 5-15 minutes. In this waiting period, no sound can be heard and no signal appeared in the screen.
I used the Disk Utility check the main disk, it appears that:
“It should be 667902 instead of 667904. Invalid volume directory count.
It should be 165702 instead of 165700. The volume Macintosh HD needs to be repaired. Error: Filesystem verify or repair failed.”
Could someone help me: how should I do? I mean waiting for 5-15 minutes to power on an iMac is terrible.
Thanks.
MAJIAN

MAJIAN,
I just used the Mac OS X install disc and the Disk Utility to repair the disk.
Good choice!
When I read your first post, I incorrectly interpreted that you used "Disk Utility" from your installation disk. Since the installation disk appears to have helped your problem, I would next recommend that you try starting up in "Safe Mode." Then as specified in that article, "restart the computer normally, without holding any keys during startup." Let us know what happens.
;~)

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