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Every time it's powered on (with no keys pressed) it shows a prohibition symbol. Using Command+R for reset doesn't work(same prohibition symbol).

  • Pressing Option mid-chime brings up the disk menu(its rather finicky about when option is pressed I've noticed).
  • I've tried using a Catalina Boot Disk, and when clicking the Catalina Disk option, it goes back to the prohibition symbol. I've tried several different commands while having the Catalina disk option chosen, with no different results (aside from variations of speed switching to the prohibition symbol).

Any suggestions about this issue? I've seen similar issues but nothing exactly like this, so any new ideas would be helpful.

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  • Sounds like a bad internal disk which can’t be booted.
    – IconDaemon
    Commented May 17 at 23:17
  • A prohibitory symbol means it cannot find a boot volume. You likely have a failed internal drive and a bad Catalina boot USB. See this answer. Also Press Option-Shift-Command-R to start up from macOS Recovery over the internet. See Internet Recovery for Intel Macs
    – Allan
    Commented May 17 at 23:55

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Reset to default

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