Dell Studio 1535 - HDMI Not Working

Hi

I have got a Dell Studio 1535 Laptop.

Tried to use the HDMi port by connecting a HDMI cable to Samsung LED TV, does not seem to work.

The HDMI Cable and the TV settings seem to be fine because same Cable and TV combination works fine with another Laptop (tested with Toshiba).

Any pointers what all do I need to check and how can I get it working.

What all driver installations do I need to check?

Thanks in advance

Mukul