Remove the Boot Camp partition only with Boot Camp Assistant, not with Disk Utility.
Jul 05, 2019 Download Mac OS X Yosemite 10.10.3 latest free latest standalone offline bootable DMG image. The MacOS X Yosemite 10.10 is a very powerful operating system for Macintosh with better stability, security, and compatibility features. MacBook Air models from 2012 or later Mac mini models from 2012 or later Mac Pro models from late 2013 (plus mid-2010 and mid-2012 models with recommended Metal-capable GPU). Love that UI, its just AWESOME!! Minimum Requirements for Yosemite iMac (Mid-2007 or newer) MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or newer) MacBook Pro (13-inch, Mid-2009. Oct 17, 2014 With that out of the way, here's a listing of the oldest Apple hardware capable of running OS X 10.10 Yosemite. MacBook – Late 2008 Aluminum, or Early 2009 MacBook Air – Late 2008. MacBook Pro (Mid 2010 or newer) MacBook Air (Late 2010 or newer) Mac mini (Mid 2010 or newer). Yosemite arrived in October 2014 and supported the following Macs: iMac (Mid-2007 or later.
Install or Reinstall OS X from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.