My macbook turns on to a grey screen with a folder in the middle of the screen.  I don't know what to do to get it to turn on...

My macbook turns on to a grey screen with a folder in the middle of the screen.  I don't know what to do to get it to turn on...
This has never happened.  I have tried to do the command-option-p-r trick and that didn't work. 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 hard drive data 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 willforce your MacBook to boot from the install DVD in the optical drive.
Once it has finished booting and you Choose Your Language and you are at the Install screen launch Disk Utility from the Utilities menu. Is your Hard Drive in the list on the left?
If it is then select the First Aid Tab run Repair Disk and 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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