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I have a MacBook Pro and from the last week I have been unable to turn the machine on properly. First it displays the Apple logo and shows this message

kernel panic

I've done a lot of research and tried things like starting in Safe Mode. Although the error message does not come up, it will just hang at a grey screen with a spinning progress indicator.

If anyone can help, please share.

  • Did you try booting into recovery mode with Cmd-R? – nohillside Apr 13 '13 at 7:30
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    Often we wake up but Computer won't. We do everything to get it back alive. One day Computer wakes up but we won't. How about returning the favor. – Ruskes Apr 13 '13 at 8:59
  • nice thought Young man....! – Buntylm Apr 13 '13 at 9:03
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This is a kernel panic and will occur when your Mac cannot possibly continue operating, and can be caused by either hardware or software.

The easiest way to determine whether it's a hardware or software problem is to boot into Recovery Mode. Restart your Mac and hold down ⌘ Command +R until the Apple logo appears on screen. If you see the following screen then there's a fair change the problem lies within the software of your Mac. You will probably need to reinstall your OS.

OS X Recovery mode

This article has more steps you can go down to help isolate the issue

If you still get the same error when trying to boot into the alternate Recovery OS, that would indicate a problem with the hardware of your Mac. Try removing as many peripherals as you can and reseating the RAM.

In the event of a problem with your hardware, I would recommend you get in touch with an Apple Authorised Service Provider to take a look at your mac, or check out Apple Support

  • try but not responding on command + R .still hang – Buntylm Apr 13 '13 at 7:47
  • How old is your Mac? Do you have recovery media, such as the install CD or USB drive? Try holding down alt on boot to boot from that – Josh Hunt Apr 13 '13 at 7:49
  • No i di't try this. – Buntylm Apr 13 '13 at 7:56
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    Thank You For sharing Got the solution Hardware problem is there so need to go on Mac store . – Buntylm Apr 13 '13 at 8:24
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It sometimes is difficult to diagnose startup problems due to the variety of reasons (hardware issues, disk corruption, wrong configuration etc.). Apple has a bunch of support documents related to this topic:

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    Thank You For sharing Got the solution Hardware problem is there so need to go on Mac store . – Buntylm Apr 13 '13 at 8:24

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