Trying to install Yosemite but it states my hard drive is being used in history but this is not the case. How do I sort this?
I want to install Yosemite but it comes up with an error stating that my hard drive is being used in history. It isn't although it does contain a back up from history which was loaded there a couple of months ago. Can someone help me sort this out please?
iMac (27-inch Mid 2010), OS X Mavericks (10.9.5)
