HDMI stops working on Satellite L750

Hi there.
Will be happy if someone can help with this issue.
I connected my Satellite L750, PSK2YA-04K010 with Windows 7 sp1, (64 bit) to my TV today using a brand new HDMI cable. It worked fine for a while and then the display on the TV went dead. I could still manage to get the display on the laptop to work.
I used Fn + F5 to see if I can trouble get it back to life but it did not work. After a long struggle, I just could not get the TV to work again with HDMI.
I checked to see if I have all the latest drivers and all seem OK. I re-installed the nVidia video drivers and then tested it again. Same thing happened. It work for a while and then died on me again.
I noticed that I have a version 1.5 BIOS but can't find a site where it lists the latest BIOS update.
Any help will be greatly appreciated.
Cheers
Hein

Hi Xaver
Thank you very much for your email. Yes, I did try another HDMI port. The TV has 3 x HDMI ports but the same thing happend on the other port.
The strange thing is that it works fine for a while. For example, I would use the FN+F5 to display a video clip on my laptop display and also on the TV display together. This will work for about 10 min and then the TV display goes black and will refuse to come back to display the output on the TV screen. I have noticed that the NVIDEA Control Panel will only show one display is connected after when this happens. Usually it will show both displays when I start off in the NVIDEA Control Panel.
The laptop display will continue to play the video on its display even after the TV display has gone black.
I have turned the TV on/off to see if the display comes back but no luck. I am pretty convinced that it will work for a few minutes if I reinstall the NVIDEA driver again (This is the latest driver on the Toshiba website).
I have looked at the 'Service Station' program and this program claims that there are no updates required.
Would be nice to know where I can find the latest BIOS upgrade for this model laptop.
Thanks again.

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