I hope this help.
First, make sure you have dvi out, monitor out singal, if you don’t have on this, your laptop can’t send out video singal external device, such as TV, Projector, etc.
Second, if you have dv or dvi output, you can hook up with S-video, HDMI, or Dvi-in(witchever you have) Than, your laptop need to switch video singal to monitor from external device, usually F5 or function + f5, you need to look it your keyboard with monitor icon near F5.
Third, all this failed, you might look into PCMCIA slot, usually universal interface for HDMI, USB, etc.
I hope this help.
FYI, majority of laptop will display to external device, even with on-board graphic card.