Is my MacBook Air corrupted?
Have a MacBook Air 2011 which I was going to sell on eBay but it's suddenly started operating slowly and when I went to open System Preferences, I got this message. I got similar messages when I tried to open Safari and the Mac versions of Word and Excel.
I'm assuming this is now a dead, irretrievable computer. Am I right or is there a fix for this?
Many thanks
Graham
MacBook Air 11″, macOS 10.12