When my 2012 mbp went down with a bad ram stick, I installed Windows 8.1 on a bootcamp partition on my wife's 2010 mbp. I got my laptop working, not longer needed to borrow hers and attempted to remove the bootcamp partition. It is gone but when ever she reboots, she has to remember to hold the option key or she automatically boots to a black screen. I assume something didn't get properly uninstalled and its attempting to load Windows bios but it doesn't exist. Is there a way to fix this? There is no time machine or back up pre bootcamp installation to restore to.

  • Have you tried booting into the recovery partition? Have you looked at any of these other similar posts? – Allan Aug 10 '16 at 14:48
  • Please don't use boring system specs as catch-line! – klanomath Aug 10 '16 at 15:24
  • Go to System Preferences, Startup Disk. Choose your Macintosh HD partition and click reboot... it should reboot and start OS X without the option key pressed. After that, it should remember which partition you selected, too. – Alejandro Iván Aug 10 '16 at 16:25

I would Recommend installing windows 10 only and getting rid of the mac partition completely. There are tons of online tutorials on how to do it. BUT if you want to use the partition and have that be the default when you hit the option key to choose your startup disk, HOLD CONTROL before you select it that you’ll notice that upward-pointing arrow—the one that points to the selected disk—will change into a circular arrow instead, indicating that the chosen disk will not only be used to start your Mac this time, but that it will also become the default boot disk.

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