What are the operating systems being used by those laptops? If one is running on Vista, is the other one running on the same OS?
Judging from the situation you presented, I have an inking that this is probably just an OS issue. If your laptop uses XP and it works fine, then that means that the OS in the other laptop may not just recognize the connection. The OS may not recognize that you connected the laptop to a television set.
Most graphic card drivers have this function to enable TV detection. If you have a way of finding that out, then try activating that.
Afterwards, reboot your laptop. That should most probably do the trick.
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