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  1. Stanton Petersen's Avatar
    I have a MacBook pro 2007 that ran on OS X Lion. I did an update and it crashed and I then got a Kernel panic (OS not set and CPU mismatch). I've tried all the commands and tried to install from a DVD and external drives by holding in the Option key. All I get by selecting a drive is a circle with a line through it. If I use the command + R key, I get the circle symbol too. At no stage do I get an option for selecting a wifi or a disk utility. I'm on the verge of giving up as this is very frustrating.
    Please help.
    Last edited by Stanton Petersen; 10-24-2021 at 03:07 PM. Reason: Spelling corrections
    10-24-2021 03:05 PM
  2. Just_Me_D's Avatar
    Have you followed the instructions found via the following link?

    https://www.wikihow.com/Reinstall-OS-X-Lion
    10-24-2021 03:44 PM
  3. Ed7789's Avatar
    I have a MacBook pro 2007 that ran on OS X Lion. I did an update and it crashed and I then got a Kernel panic (OS not set and CPU mismatch). I've tried all the commands and tried to install from a DVD and external drives by holding in the Option key. All I get by selecting a drive is a circle with a line through it. If I use the command + R key, I get the circle symbol too. At no stage do I get an option for selecting a wifi or a disk utility. I'm on the verge of giving up as this is very frustrating.
    Please help.
    If Command+R does not work, have a try at Option+Command+R

    Also, it seems that the 2007 MacBook Pros can run up to OS X 10.11.6, which is OS X El Capitan. So you could try starting on Mountain Lion or anything more recent.
    Last edited by Ed7789; 10-24-2021 at 09:58 PM. Reason: Corrected MacBook Pro model year
    10-24-2021 09:57 PM
  4. Annie_M's Avatar
    Thanks for the heads of @Ed7789. The thread has been moved to the MacBook Pro forum!
    Ed7789 likes this.
    10-25-2021 10:18 AM

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