Greenish screen after wake up using external monitor
I use an 23" hp monitor with my MacBook Pro 2012. Now I have upgraded to Mavericks, after I wake up the machine from sleep the screen looks like this (a greenish screen).
I have to open the machine itself inorder to have a proper colour on the ext. monitor again.
MacBook Pro (13-inch Mid 2012), OS X Mavericks (10.9)