I want to remove Windows from Mac and the I know the simple way is through the Boot Camp Assistant. But that doesn't work for me as follows:
However, when I try to merge the partition of windows through disk utility, all buttons are inactive, and I cannot press either '-' or 'option' button, like follows:
Then, I try to reinstall a new Mac osX from the internet by pressing and holding the [command]+[alt]+[R] when starting the computer, and it doesn't work either. I am informed that the system cannot be installed in either the BOOTCAMP partition or Untitled partition since they are not GUID partition table format.
I am a newer to Mac and I just want to delete the Windows partition and add the space back to my osX partition. I wonder what should I do next?
Thanks for help!