i connected my computer to my HDTV 47in and it worked for only a minute before the screen went blue and said not support what that mean?
You have the black screen set to display as blue, so here it is:
Are you using an HDMI cable or Displayport cable?
If you are, these cables cause the black blinking screen. There is a DRM chip in the graphics card of the video source as well as in the TV tuner. When signals going from one to the other don't synch up, this black blinking screen comes on. I have to use a VGA(D-sub) connector from my computer to TV, because the HDMI cable causes the black screen blinking.
No other TV I tried the HDMI cable on has the Black screen blinking problem, so it is a problem with my TV's HDMI DRM chip/circuit synching correctly to the DRM signal sent from my computer's graphics card DRM chip.