Home Forums Apple Help Help - I've bricked my MacBook Pro. Tech Helproom | Windows Help | Apple Help | Digital Home & Smartphones Help | Consumer Rights Advice | Games | Speakers Corner | Beta Testing Forum Rules | Contact Forum Editor | Report a Post Help - I've bricked my MacBook Pro. Hampstead 10:44 27 Jul 2017 Locked I am selling my MacBook so thought I'd clean it up first. I ran the disc utility and erased disk - All good so far, then I formatted the disc to OS X Base System. Wrong! I can't install macOS Sierra as the disc is incorrectly formatted. Everything is greyed out noe in disc utility. What can I do to get this running again? I have macOS Sierra on a USB if it helps. It won't boot from there though. Procrastinus 12:05 27 Jul 2017 I am NO expert with Mac, but you could try formatting your HDD with Mac OS Extended(Journaled). I believe this to be the format for re-installation. Good luck! Forum Editor 18:03 27 Jul 2017 Moved to Apple Help from Tech Helproom. HondaMan 21:10 27 Jul 2017 Go to the Macworld site. look for a "How to ..." article on creating a bootable flash drive. After you have created your bootable drive you can reinstall Sierra This thread is now locked and can not be replied to.