My wired keyboard is starting to flake out and I'm not able to PRAM reset the machine at boot with the Option ⌥ + Command ⌘ + P + R sequence. I tried plugging in a Windows keyboard and use Alt + Windows key + P + R , but the Mac doesn't seem to recognize the sequence.

Is there a command line equivalent to the keyboard boot sequence above? I tried sudo nvram -c but that didn't seem to do it.

The idea is that I want to set the boot volume to something else, but I'm flying blind on a MacPro3,1 since the video card is a non-EFI PC one so I can't just do the "hold option at boot" trick.

Any ideas?

  • Would setting the boot volume with the Startup Disk option or bless command be sufficient? – lx07 Mar 30 '20 at 17:11
  • bless does work for setting the startup drive, but that doesn't do the PRAM reset. So yes, I did get my boot drive issue solved but leaving question as-is since I still don't see a command line equivalent to the key sequence above; I did a sudo nvram -c as indicated, but it didn't reset the boot drive so they don't appear to be equivalent. – bjb Apr 1 '20 at 13:13

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