Bold: 10.8.4 ?????It is MBP mid 2010.
I upgraded my RAM to 8 Gb. It is often happen when I connect tv through hdmi-minidisplay port, but it isn't neccesary to happen. On the external screen it is normal. I have 10.8.4 OS.
@lapy When MBP is connected to TV it is lying like open book on his right side