Macbook Pro, bought 2012, takes a very long time to start up/restart (5 mins). How do I fix this?

My Macbook Pro, bought 2012, takes a very long time to start up/restart (5 mins) every single time I have shut it down. I try not to shut it down at all now because once or twice, I have got a grey screen, and then nothing. I've held down the power button to shut down again and restart How do I fix all this?

Start up with your built-in Recovery disk by holding down the Command and R keys when starting. Open Disk Utility from there and use it to REPAIR your disk (you've already verified it and it came up with errors).
With any luck, your problems will be solved. While I was there, I would also repair permissions.
Good luck,
Clinton

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Here are the Mac requirements:
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Only if your home/renters insurance doesn't cover such damage without raising your rates/dropping you. Ask first of them if it is worthwhile the claim once you get an estimate for repair. These repair places are pretty good:
http://www.dttservice.com/
http://www.powerbookresq.com/
http://www.microdocusa.com/
http://www.macspecialist.com/
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