Satellite L750D - no HDMI video out on external TV

I have a Satellite L750D and a SyncMaster Smart TV
I want to hook up my laptop to the TV with a HDMI cable.
When connected, my laptop discovers the TV and can create an extended desktop but the TV says no signal.
I have tested the TV with another laptop and it works fine.
I deleted the display driver and was able to get some video on the television but the colour was bad and the option to extend was disabled. On top of this I was unable to change my screen resolution.
I installed the latest drivers provided by Toshiba which is dated 09/05/2011. Same issue, no signal.
Any suggestions on a fix?
Is there later video drivers I can download?
AMD suggest I go here for drivers.
All help appreciated.

Hi
I guess you installed Win 7. Right?
> I installed the latest drivers provided by Toshiba which is dated 09/05/2011
There is a newer display driver released at 04/13/12 [AMD display driver v8.911.6 Windows 7 - 64 Bit|http://www.toshiba.eu/innovation/download_driver_details.jsp?service=EU&selCategory =2&selFamily=2&selSeries=178&selProduct=6463&selSh ortMod=null&language=13&selOS=30&selType=all&yearu pload=&monthupload=&dayupload=&useDate=null&mode=a llMachines&search=&action=search&macId=&country=al l&selectedLanguage=13&type=all&page=2&ID=81347&OSI D=30&driverLanguage=42]
Install this one.
Furthermore you should install other tools like Toshiba Value Added Package, AMD Display Tool, ATI Sound Driver as well as Conexant Sound driver and others.
Then you should be able to use FN + F5 in order to switch to the external video output

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