Try this. Change the refresh rate on the laptop to 60Hz.
With my last laptop I connected it to the TV (I teach and I use the TV instead of a blackboard - I type and kids see it on the tv)
With my new laptop (LG-LM50 and I love it) I got a new cable, plugged in and I can see the images but no matter what i do I can't seem to get anything but black and white on the TV.
Any ideas very gratefully received. Thank you