Mac Pro (Late 13) unable to boot from USB

Discussion in 'Mac Pro' started by Antony Harvey, Sep 30, 2015.

  1. Antony Harvey macrumors newbie

    Sep 30, 2015
    Hi forum

    I've had no end of issues with my Mac Pro since I brought it last year, however this recent problem is a new one for me

    I have just installed a new set of RAM (all matched in pairs). I booted up no problem, the RAM shows in About this Mac and everything was as it should be. I opened up After Effects and ran a hugely complexed project at it. It worked like a charm, no issues or problems.

    After this I began the process to wipe my hard drive and reinstall Yosemite to fix a few issues I have been having. I created a USB with the most recent version of the OS, backed up and shut down.

    This is where the trouble started. When I try to boot from the USB drive (holding the option/alt key) the system doesn't boot, it hangs on a black screen and goes nowhere. I have tried to run the diagnostic suite during boot and I get the black screen again.

    I've tried all the standard troubleshooting, resetting the PRAM, repairing permissions, SMC. I have even installed the OS from the App and tried again but I'm still getting the black screen.

    Has anyone had any experience with a similar issue?

    Mac Pro

    3 Ghz 8 core Xeon E5

    64GB 1866 MHz DDR3 ECC

    AMD FirePro D700 6144 MB
  2. satcomer macrumors 603


    Feb 19, 2008
    The Finger Lakes Region
    I never use the 'option' key to boot from something when using OS X. I just use System Prefrences->Startup Disk to select the bootable external, then just do a restart.
  3. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
  4. Bad Leopard macrumors member

    Jan 14, 2014
    I was running Windows on an external ssd for a while on my nMP, so I was using the option key start up quite often. Once in a while, I would get the same thing you describe, where there was just a black screen. I finally figured out that when that would happen, the boot selection screen was actually there, but it just wasn't being displayed. I already knew from memory how many times to arrow over to the windows drive and hit enter, and would boot to Windows. Worth a shot anyways.
  5. Antony Harvey thread starter macrumors newbie

    Sep 30, 2015
    Yes I run a 4K monitor as my main screen and have a old Cinema Display as a second screen when I have a client in with me. That is a good point though, I'll hook up the Cinema Display when I try again
  6. Antony Harvey thread starter macrumors newbie

    Sep 30, 2015
    Thanks, I forgot about setting the start up disk. I'll try this later
  7. Antony Harvey thread starter macrumors newbie

    Sep 30, 2015
    Thanks, worse case I can give it a try

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