think my HD has become corrupted as cannot reinstall anything
I have been trying to use disk utility to repair my drive. I have two partiitions and wanted to erase and reinstall yosemite on my imac 2011 but have had untold problems. Sometimes it doesnt even recognise my drives and in Disk utility I cant repair or reformat anything. Any help would be appreciated. Does anone think my hard drive might be screwed?
iMac (27-inch Mid 2011), iOS 6