Mac OS X 10.6 freezes at shutdown

Hi, I have this problem it's really bothering me. Every time I shut down my mac, it freezes at the blue screen with the wheel. I originally thought it would be my usb devices that caused the problems so I tried ejecting/unplugging (a hassle all by itself) all of them then shutting down, and freezes again. So i plugged in the 10.6 install disk and verified the disk, and found no problem. Does anyone have any other ideas about what's going on? I don't want to force shut down the mac cuz the last time i did it, the mac was never able to boot up, not even to safe mode, and i had to re-install mac os. Now i am afraid of shutting it down because of that previous experience.

Hi setomoto;
It sounds like you have some serious problems with your disk. I would suggest booting with install DVD for your Mac and repairing the disk.
Allan

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