No mouse pointer when connected to TV Samsung led40/6500. Mouse works but doesn't show?

Just bought Mac Mini. Connected to Samsung 40/6500 ledtv. using mouse pad but no pointer seen. Finally found the resolution working, but not the right resolution. Should be 1920x1080 @ 60 hz via HDMI. Mac Mini's best is much different from this. How can I find the right resolution on my Mac Mini.

It actually works fine on my sons Lumatron cheap tv! But not on the Samsung led tv?
To start with I used an app on my Iphone to recieve the image from the Mac Mini and then try to find the right resolution on the MAC. Because every time I choose the wrong one the display went black. I could then still see the image on my phone and troubleshoot my way through...

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