Having problems with your Flat Panel Televisions ?

I have a toshiba 46XV550A flat screen. I have previous been able to watch video from my laptop via HDMI, however now when I plug it in all I get is the TV going from blue to black screen. The laptop LCD screen also used to turn off and you could toggle between using it and the TV screen using Fn F8, however the laptop doesn't seem to recognise the TV anymore... it keeps the visual on the laptop even when I plug in the HDMI cable to to the TV and Fn F8 doen't seem to work any more - do you know

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