5,1 bad nvram args cant boot

Discussion in 'Mac Pro' started by davidosomething, May 17, 2019.

  1. davidosomething macrumors newbie

    davidosomething

    Joined:
    May 17, 2019
    Location:
    New York, NY
    #1
    Tried to enter recovery mode using
    sudo nvram "recovery-boot-mode=unused"
    sudo reboot


    Now my 5,1 on mojave with an rx580 just gets stuck on a blank screen. I tried optcmd PR, and even going back to a 5770 with usb install medium for high sierra (all drives unplugged).

    Anyone have advice on how to get this thing booting again?
     
  2. startergo macrumors 6502a

    startergo

    Joined:
    Sep 20, 2018
    #2
    Try NVRAM reset 3 consecutive times.
     
  3. davidosomething thread starter macrumors newbie

    davidosomething

    Joined:
    May 17, 2019
    Location:
    New York, NY
    #3
    Tried 3x consecutive, still getting the black screen
    Is there a hardware switch for nvram reset maybe?
     
  4. handheldgames macrumors 68000

    handheldgames

    Joined:
    Apr 4, 2009
    Location:
    Pacific NW, USA
    #4
    What's your system config? What has been working? What were you booting from? What changed to get you here?

    With these questions answered in detail, many here can help.
     
  5. davidosomething thread starter macrumors newbie

    davidosomething

    Joined:
    May 17, 2019
    Location:
    New York, NY
    #5
    mojave 10.14.5, fw 144.0.x
    single x5680 48gb ram
    booting from evo970
    sapphire radeon rx580 single display over hdmi
    real apple wireless card with bt4

    everything was working up until rebooting with the nvram flag above
     
  6. crjackson2134, May 19, 2019 at 6:52 PM
    Last edited: May 19, 2019 at 6:57 PM

    crjackson2134 macrumors 601

    crjackson2134

    Joined:
    Mar 6, 2013
    Location:
    Charlotte, NC
    #6
    No.

    How long did you let the computer sit on the black screen before declaring it was stuck?

    What NVMe adapter are you using? Is there a recovery partition on the SSD. Sometimes people clone a working install over to NVNe using CCC and don’t copy the recover partition.

    Did you try using a different display port?
     
  7. h9826790 macrumors G5

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #7
    Remove all drives.

    Remove RX580.

    Install HD5770.

    Press and hold Command + Option + P + R.

    Press power button to switch on the Mac.

    Keep hold down the keys until you hear the 4th chimes. (You should able to see the white screens during this process. If not, check the cable / monitor)

    If reset successful, you should see a folder with question mark, which means can’t locate the boot drive.

    Shutdown, install the boot drive.

    Press and hold Option key, then power up the Mac.

    Now you should able to select the boot drive,

    Once you can boot to desktop. Shutdown, remove the HD5770, re-install the RX580.
     
  8. davidosomething thread starter macrumors newbie

    davidosomething

    Joined:
    May 17, 2019
    Location:
    New York, NY
    #8
    I've left it on overnight in its stuck state
    Using a Angelbird Wings PX1 PCIe x4 M.2 Adapter -- I think you've hit the nail on the head there - no recovery partition and NVRAM is set to try to load from one.

    I've booted into recovery before with the same hardware setup.


    I'll try h982690's boot 5770 and no drives too, but I think the fact that NVRAM reset via Cmd-Opt-P-R not working is going to get in the way. Tried a 5770 with a USB high sierra before to no progress.
     
  9. tsialex macrumors 601

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #9
    Did you used an USB keyboard? Apple wireless keyboards sometimes don't work after the first clear NVRAM and you need 3 to really clear the NVRAM settings.
     

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8 May 17, 2019