I recently had to restore my computer from a TM backup. Everything works find except for my external screen. I have a VGA adapter that I use to attach my MacBook to my Vizio HDTV. Upon reattaching my TV for the first time the resolution was not optimal (slightly blurred, black bars on side) so I tried going back to my original screen resolution. This caused my laptop screen to go black and the TV said no signal. The only way I could get my laptop screen back was to do a safe boot and change the settings back. Now when I attach the display adapter my laptop screen refreshes but the TV continues to say no signal. I cannot detect any new displays and gather windows does nothing. Ack! I would really appreciate some help! We miss our Hulu and Netflix on the big screen!