How can i boot my mac properly?

I am this troble with my macbook, when I started it up, it usally showing the logo of the apple and a loading gear, and mine does the same but the only thing i can't understand is that it takes a lot of time to load, maybe 10 to 20 minutes. And after that the logo of the apple is gone and was replaced by a circle with a diagonal line at the center. And I don't know what does that mean. Can anyone help me? And ohh that loading gear is still rotating.

The circle with diagonal means the computer cannot find a bootable partition. The long time for the circle to appear says faiing hard drive.
If it is running OS 10.6.1 as in your profile, You MBP should be old enough to have come with system DVDs that can be used to assess the hard drive. I sincerely hope you still have them.
Force-stop the loading process so the computer will not overheat. Otherwise you could be faced with a larger repair bill taht just an new hard drive.

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    i created a windows partition that was too small and cant install windows... how can I boot on my mac drive to correct this... my computer is defaulting to the windows partion... tried f1 f7 f12... Help

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      2. Immediately after the chime press and hold down the "OPTION" key.
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  • How can I boot and run my Mac Mini on my 12" PwrBk display using firewire?

    How can I boot and run my Mac Mini on my 12" PwrBk display using firewire?

    bwhit:
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    1. With both computers shut down connect both via firewire.
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    I have  lost everything on my mac, a gray screen with a folder and question mark is blinking. i hav another mac that is running slowly, how can I boot and reinstall os x Lion, i do not have the start up disc with me.

    Welcome to the Apple Support Communities
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    Dalfe wrote:
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    My MacBook Air lost mac os x. So I would like to reinstall mac os. But I can't select the disk to install mac os x. Only Recovery HD is shown and I can't select it. How can I reinstall my Mac os x? Thank you!

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