diagnosing reason macbook pro won't boot

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diagnosing reason macbook pro won't boot

My Macbook pro (15" from mid 2009 but upgraded to mountain lion a couple months ago) started getting really slow and unresponsive as I was using it. I shut it down manually and then started it back up but it hung on the gray screen with the apple logo and spinning circle.

Rebooting in verbose mode gave me disk0s2: I/O error

Booting using command+r and using disk utility to repair the disk didn't find anything wrong.

Additionally, I have a windows partition and can successfully boot and use that on the laptop.

It doesn't look like a hard drive failure to me because i can still use some of the partitions on the drive, but I'm not sure what else could be going on?

Does anyone have any other things I can try and debug or suggestions as to what is going on?

Thanks.

MacBook Pro (15-inch 2.53 GHz), OS X Mountain Lion (10.8)

Posted on Jan 10, 2013 1:43 AM

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Answer 1

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clintonfrombirmingham

Level 7

30,100 points

Jan 10, 2013 1:56 AM in response to 9w3r7y

Did you use Disk Utility on the "Macintosh HD" partition or for the whole drive?

It still sounds as if something's up with your startup disk (partition). Try running Disk Utility again. If still no errors, tryresetting SMC. No joy? The Apple Hardware Test. Still having trouble? Time for a trip to your local Apple Store or AASP.

Good luck,

Clinton

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Answer 2

Linc Davis

Level 10

209,547 points

Jan 10, 2013 11:39 AM in response to 9w3r7y

The boot drive is failing, or you have some other hardware fault. I hope you have backups.

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