I've got a 15" white macbook which I bought about 2 years ago. It froze the other day and wouldn't respond so I shut it down. When I turn it on now it comes up with a flashing file with a question mark on it. How can I fix it?

I've got a 15" white macbook which I bought about 2 years ago. It froze the other day and wouldn't respond so I shut it down. When I turn it on now it comes up with a flashing file with a question mark on it. How can I fix it? I've tried a few things i've seen online but the futhest ive got is to put the start up disk in when you makes it go to a grey screen with an apple logo and the spinning wheel which then stops spinning. Can anybody help?

That folder with the question mark icon means that the MacBook can't find the boot directory. That can either mean it can't find the hard drive or the Operating System data on the hard drive is somehow corrupted.
Put your install DVD into the optical drive and reboot. As soon as you hear the boot chime, hold down the "c" key on your keyboard (or the Option key until the Install Disk shows up). That will force your MacBook to boot from the install DVD in the optical drive.
When it does start up, you'll see a panel asking you to choose your language. Just press the Return key on your keyboard once.It will then present you with an Installation window. Completely ignore this window and click on Utilities in the top menu and scroll down to Disk Utility and click it. When it comes up is your Hard Drive in the list on the left?
If it is then click on the Mac OS partition of your hard drive in the left handlist. Then select the First Aid Tab and run Repair Disk. The Repair Disk button won't be available until you've clicked on the Mac OS partition on your hard drive. If that repairs any problems run it again until the green OK appears and then run Repair Permissions.
If your hard drive isn’t recognized in Disk Utility then your hard drive is probably dead.

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