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StephenC · 2013-06-16, 17:37

Hi Guys,

I was forced to restart MacBook Pro when a kernel panic happened about 2 hours ago... Since then my computer would just stuck on the grey screen with the Apple logo every time I tried to reboot it. Some useful log appeared when I tried to boot it in Safe Mode:
disk0s2: I/O error.
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 5] [IOType Read] [PBlkNum 24] [LBlkNum 2][FSLogMsgID 327376684] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode root_device] [MountPt /] [FSLogMsgID 327376684] [FSLogMsgOrder Last]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 5] [IOType Read] [PBlkNum 55232] [LBlkNum 763][FSLogMsgID 375551380] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode root_device] [MountPt /] [FSLogMsgID 375551380] [FSLogMsgOrder Last]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 5] [IOType Read] [PBlkNum 55008] [LBlkNum 749][FSLogMsgID 299898203] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode root_device] [MountPt /] [FSLogMsgID 299898203] [FSLogMsgOrder Last]

That was when the booting process got stuck. The log seemed to suggest that there were problems with the disk i/o and mounting the file system.

To you experts:
Can you interpret what this means? Was this a hardware problem? Can you decide more specifically what the problem was? Do you have any suggestions of a potential fix?

Thanks,
Stephen

709 · 2013-06-16, 20:19

Have you tried starting up while holding the Shift key down? That'll force a directory check and may ferret out something on the software side that got boinked somehow.

Edit: skimming on the phone will be the death of me. :/. Try holding down Cmd+R at startup. That'll bring you to a screen where you can run Disk Utility iirc.

Ebby · 2013-06-16, 20:52

Is that recovery thing built into the firmware? If the drive is hosed it wouldn't load anything even from a recovery partition.

I gotta try that now

709 · 2013-06-16, 20:57

Yeah. I've had the grey-screen-hang before and booting up through that "secret partition" and running DU cleared it up.

If it was a hardware thing I doubt it would be booting at all.

StephenC · 2013-06-16, 22:16

The computer kept restarting itself in recovery mode...

709 · 2013-06-16, 23:22

You have to hold Cmd+R down until your fingers go numb, sometimes, but if you've gone through that without any success, ugh. Now we're talking boot-disc type shit.

Unless you may have another Mac somewhere - you can try FireWire Mode to mount it as a child-machine, then try to run DU on it.

If it doesn't mount in FW mode then there's some shit going on. Likely software, so don't give up trying reboots.

Edit: check out this list of finger-bleeders: http://support.apple.com/kb/ht1533

I'd try some of those before the FW thing. Yes, you may have to park a drink on some of the keys while you wait for a reboot, but hopefully one of those will work, if not help a little.

StephenC · 2013-06-17, 00:25

I held command+r until the apple logo appeared. Do you need to hold the two keys longer afterwards?

Also, can you say for sure that this is a problem with my hard drive? Could physical impacts be the cause of the problem(which happened 10-20 minutes before my mac died).

Ebby · 2013-06-17, 00:44

The error suggests there are problems reading/writing data to the drive. An impact is not good for it, and too much can cause the heads to make contact with the platter which is bad. If there is a mechanical fault, such as a bent head, there is a possibility of scratching data clean off the disk. I'd slap that sucker in an external case asap and save your files elsewhere just in case you don't have a backup.

I can't say for certain this is the problem, but one thing I've learned over the years is not to give hard drives second chances. If they act up and it wasn't my fault to begin with, it is outta there.

StephenC · 2013-06-17, 08:31

If the hard drive had failed as you said, does that explain why the mac would not even boot in recovery mode?

Dave · 2013-06-17, 11:34

Yeah, if the drive is physically borked, you might not be able to boot off its recovery partition.

FFL · 2013-06-17, 13:12

Have you tried booting in single-user mode?
And then running fsck ?

http://support.apple.com/kb/HT1492

But yeah - it sounds like you need a new hard drive.

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709 ¡Damned! Join Date: May 2004 Location: Purgatory	2013-06-16, 20:19 Have you tried starting up while holding the Shift key down? That'll force a directory check and may ferret out something on the software side that got boinked somehow. Edit: skimming on the phone will be the death of me. :/. Try holding down Cmd+R at startup. That'll bring you to a screen where you can run Disk Utility iirc.
	quote

Ebby Subdued and Medicated Join Date: May 2004 Location: Over Yander	2013-06-16, 20:52 Is that recovery thing built into the firmware? If the drive is hosed it wouldn't load anything even from a recovery partition. I gotta try that now
	quote

709 ¡Damned! Join Date: May 2004 Location: Purgatory	2013-06-16, 20:57 Yeah. I've had the grey-screen-hang before and booting up through that "secret partition" and running DU cleared it up. If it was a hardware thing I doubt it would be booting at all. Last edited by 709 : 2013-06-16 at 21:10.
	quote

StephenC New Member Join Date: Jun 2013	2013-06-16, 22:16 The computer kept restarting itself in recovery mode...
	quote

StephenC New Member Join Date: Jun 2013	2013-06-17, 00:25 I held command+r until the apple logo appeared. Do you need to hold the two keys longer afterwards? Also, can you say for sure that this is a problem with my hard drive? Could physical impacts be the cause of the problem(which happened 10-20 minutes before my mac died).
	quote

StephenC New Member Join Date: Jun 2013	2013-06-17, 08:31 If the hard drive had failed as you said, does that explain why the mac would not even boot in recovery mode?
	quote

Dave Ninja Editor Join Date: May 2004 Location: Bay Area, CA	2013-06-17, 11:34 Yeah, if the drive is physically borked, you might not be able to boot off its recovery partition.
	quote

FFL Fishhead Family Reunited moderator Join Date: May 2004 Location: Slightly Off Center	2013-06-17, 13:12 Have you tried booting in single-user mode? And then running fsck ? http://support.apple.com/kb/HT1492 But yeah - it sounds like you need a new hard drive.
	quote

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Mac Kernel Panic, Problem Rebooting.