My MacBook displays folder with a "?" at start up. How do I address this?

MY question is in the title.

There are four general causes of this issue:
1. The computer's PRAM no longer contains a valid startup disk setting when there aren't any problems with the disk itself. This can be checked for by pressing the Option key and seeing if the drive appears.
2. The internal drive's directory structure has become damaged. This requires usage of an alternate bootable system to perform the repair.
3. Critical system files have been deleted. This requires usage of an alternate bootable system to reinstall them.
4. The internal drive has died or become unplugged. This is the most likely case if the computer took a sharp impact or there are unusual sounds coming from the hard drive's location.
(68747)

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there's an adaptor for mini dvi to s-video
a well known auction site would yield results if apple don't stock it

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Clinton

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Provide the computer's firmware password. If you don't know what it is, contact the person you got the computer from or Apple.
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<Edited by Host>

Hello Khayalh,
You should be able to link your phone number by following the steps in the article below. From your iPhone, sign out of FaceTime and iMessage and then sign back in and it should link. Check in the Start Conversation With and I Can Be Reached at section in iMessage and FaceTime respectively.
iOS and OS X: Link your phone number and Apple ID for use with FaceTime and iMessage
http://support.apple.com/kb/HT5538
Regards,
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My MacBook displays folder with a "?" at start up. How do I address this?

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