Try messing around with the Display System Preference. I would suggest that you turn off mirroring, then selecting a standard HDTV resolution for the Sony (e.g. 1920x1080).
I'm thinking the intermittent flashing of the screen is due to you having the displays set to mirror and the MBP's resolution may not be supported on the Sony.
Hope that helps.
ft
Try messing around with the Display System Preference. I would suggest that you turn off mirroring, then selecting a standard HDTV resolution for the Sony (e.g. 1920x1080).
I'm thinking the intermittent flashing of the screen is due to you having the displays set to mirror and the MBP's resolution may not be supported on the Sony.
Hope that helps.
ft