kylehenriques

Q: Cannot finish installation of OS X Mountain Lion

I am working on my iMac A1312 (I know this fell under the recall however my machine was not under warranty). Since I work on PC's all of the time, I figured I could tackle my Mac. First off, what I did do was upgrade my graphics card to 1gb and my hard drive to 1.5tb (I know, overkill). So I go and try to reinstall Mountain Lion. After everything is all said and done, I still get the Apple logo with the loading wheel underneath it.

 

I tried safe boot and as I was holding shift, I got a mix of blinking symbols.. Apple, Folder, and a symbol as if it was a Do Not Smoke sign without the cigarette. Once I let go of the shift button, it went to a solid Apple logo, with the loading wheel underneath it again.

 

I then tried the verbose start up. I got a bunch of text but then I noticed it said:

 

disk1s2: I/O error

disk1s2: 0x5 (UNDEFINED)

 

and then it goes with the undefined for several after, and then just continues to do that.

 

I went back to disk utilities and verified and repaired the drive, and it was fine.

 

I am beyond confused on what to do or what I can do now.

 

Any help would be greatly appreciated!

 

Kyle

iMac, OS X Mountain Lion (10.8.5)

Posted on Oct 26, 2015 6:52 PM

Close

Q: Cannot finish installation of OS X Mountain Lion

  • All replies
  • Helpful answers

  • by Eric Root,

    Eric Root Eric Root Oct 27, 2015 9:26 AM in response to kylehenriques
    Level 9 (70,042 points)
    iTunes
    Oct 27, 2015 9:26 AM in response to kylehenriques
  • by Bob R Oregon,

    Bob R Oregon Bob R Oregon Oct 27, 2015 10:15 AM in response to kylehenriques
    Level 1 (80 points)
    Mac OS X
    Oct 27, 2015 10:15 AM in response to kylehenriques

    I have no idea of what your problem is, I came here looking for some info and saw your post.

     

    0) Did [re]install finish and now you can't boot properly, or did you get the pinwheel for a long time at the end of install and you then powered your iMac down?

     

    1) which iMac do you have, what year and did installation discs come with it? How are you trying to reinstall Mountain Lion? iMac A1312 could be any of a number of different iMacs 2009-2011. Sometime around 2011 with Lion & Mountain Lion, Apple stopped including discs and you have to use internet recovery. What may be important is which OS your machine was originally shipped with, not which one it most recently had been upgraded to.

     

    If your iMac still works with the old hard drive, I would put that back in and create a recovery system on an external drive first OS X: About Recovery Disk Assistant - Apple Support, or if you have your old drive in a usb adapter, I think you can boot off of it, it will be slow but you can do things.

     

    2) How many disks do you have? The errors you report are for disk1*    Isn't the boot disk0* ?  Do you still have a disc in the optical drive and it is that one that has errors? If that has a problem you will have difficulties booting or installing off of it.

     

    I would remove all discs except one, erase that drive and re-install the original OS that came with the machine. If reinstall discs were included when the iMac was originally shipped, you could put the one in that has diagnostics and run that. Without reinstall discs, hold D or option-D when booting.