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Suddenly Cannot Duplicate Laptop's Screen To HDTV

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The day before yesterday i bought 2M [email protected] HDMI cable and succeeded duplicating laptop's screen to LG HDTV. Yesterday i tried again but this time the option for duplicating screen did not show up and i could only extend screen.

I tried playing with resolutions, connecting to HDTV and then starting laptop, switching between HDMI cable's ends - all to no avail. The option disappeared. There was another option but it made 1|2 multiple screens in my laptop's screen to appear and nothing on HDTV.

System Information:

DELL Latitude E6420
Intel HD Graphics with nVidia NVS 4200M
Windows 7 Enterprise

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