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The first thing to do is to troubleshoot to see if there is an easy fix solution like a cord being out of place or a bulb being burnt out. Quite often this is not the case, however it is always good to get the help from someone else if you are not all that computer savvy.
The next best thing to do is to determine if the crash was caused by a physical or logical failure. Quite often the same error messages appear for both problems. If your computer will not start, and you hear clicking or grinding noises, then it is more than likely a physical drive failure. At that point, it is best to stop trying to boot the computer and to contact the best available customer service for the computer you have.
When you are out of luck with figuring out how to fix the problem on your own, and dealing with customer service is now out of the question, calling a data recovery services company can help save a huge amount of time and effort on your part.