I bought a new MacBook Pro 15 when I was in the States 2 months ago. It came equipped with Messages. Messages has worked fine until I installed Yosemite on Friday. Since then Messages stopped working and when I restart into the remote disc form, I can no longer use the Disc Utility to check the MacHD. Any ideas? It is 3PM Perth Western Australia time which makes it 3AM Eastern Standard Time US, so I don't expect too many replies at this time. Thanks!