174 Views 2 Replies Latest reply: Feb 2, 2014 2:05 AM by Parveln
Hello I tried to download an update but when I started the macbook again I got a greyscreen. I tried to reinstall the os but it says "You cannot upgrade this version of OS X because a newer version is installed." on my only disk when I try to select it. I don't have any time machine backup what should I do?
I reas online and the greyscreen seems to be because of à Thunderbolt update. To fix it. you should reinstall the OS but i can't.