Yes you can do this.
There are a number of issues:
1. You will have to connect external speakers (2.1 Channel maximum) or use Laptop sound (not recommended).
2. You will have to set up dual monitors in either windows 7 (am assuming you are using this). Right click on desktop and select "screen resolution".
3. Or you can set this up in either CCC (for ATI cards) or NVIDIA control panel (for NVIDIA cards).
3. If you are not getting a picture, try connecting the ac adapter to the laptop first. My sister took 2 weeks to figure this out.