Satellite A300-15J - Picture freezes on external monitor

Hey there,
I have some problem here with ATI 3470HD. Recently I bought LCD TV Samsung 2333HD, when I connect it with notebook (as primary and the only monitor) in few minutes pictures it just freezes and turns black for a few seconds. It's like graphic card would reaload itself (tried on more resolutions). I tried to connect LCD TV to the PC and it's working. However interesting is that I also tried to connect notebook with the other LCD TV and it was working fine.
There is one more issue, is it normal that 720p HD video freezes?
I'm thinking about seding notebook to sevice. By the way I tried 3DMARK and also VideoCardStabilityTest, all good. Any idea?
Thankx.
Andrew

Hello
Its not easy to say what is the reason for this...
Before you sent it to the service center I would try to update the display driver and BIOS. Both you can find on the Toshiba website:
http://eu.computers.toshiba-europe.com => Support & Downloads => Download Drivers
Have you tested another cable? Check this!
Greets

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