Strange MS-Dos type screen on boot and shutdown.

Discussion in 'Apple Forum' started by m1stergeorge, Aug 27, 2012.

  1. m1stergeorge

    m1stergeorge
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    Hi Guys,

    I've been experiencing a slight issue with my 21.5" iMac recently and can safely say it has only happened since the upgrade to Mountain Lion.

    Around 1 out of ever 4 boots(ie once, maybe twice a week), the iMac goes to a funny looking MS-DOS type screen and will usually show the same thing when it shuts down (only shows on shut down if it did it on startup). I've linked a couple of photos (they wouldn't attach) to try and give you an idea, has anyone come across this before?

    https://www.dropbox.com/s/hj6a0pakakuo7ei/Photo 27-08-2012 12 34 55 (HDR).jpg

    https://www.dropbox.com/s/hj6a0pakakuo7ei/Photo 27-08-2012 12 34 55 (HDR).jpg

    Many thanks.
     
  2. dante01

    dante01
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    Looks as though the Mac is booting up into verbose or single user mode? Are you pressing any of the keys on the keyboard during start up? Have you installed anything such as Applejack or Mountain Lion Cache Cleaner onto your Mac?

    Have you altered anything via terminal in reference to verbose mode such as instructing your Mac to always boot into this mode? If so then you can turn this off via entering this command in terminal:

    Code:
    sudo nvram boot-args=
     
    Last edited: Aug 27, 2012
  3. m1stergeorge

    m1stergeorge
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    I"m gonna have to Google Verbose mode I'm afraid!

    In answer to the question though, no, nothing is near the keyboard upon bootup. Other than that, there's been nothing installed on the machine since the ML upgrade.
     
  4. dante01

    dante01
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  5. m1stergeorge

    m1stergeorge
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    Will look into that, thanks for your help though!
     
  6. dante01

    dante01
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    Another tip I've read suggests you go into system preferences and reselect your preferred start up disk even if already selected and then restary your Mac. This apparently rectifies the issue?
     
  7. hutch

    hutch
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    I've had that a couple of times as well
     
  8. SUMMONER

    SUMMONER
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    If you can get to the Mac OS desktop, run Disk Utility, select Macintosh HD on the left and click repair disk on the bottom right.

    If you can only get to the command prompt, enter fsck -y and press Enter. This will check for and try to fix problems on the hard drive.

    Hope this helps.
     
    Last edited: Aug 28, 2012
  9. m1stergeorge

    m1stergeorge
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    Thanks guys, will see what I can do tonight as I didnt have chance yesterday.

    Have you upgraded to Mountain Lion as well?
     

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