A true HDTV has a DVI port and/or HDMI ports. You can connect your computer straight to the DVI or to HDMI with a DVI to HDMI adaptor. However, with the HDMI connection, even though normally it carries sound as well, you won't have sound with this setup because the PB does not send sound signals out the DVI port. You'll need separate audio cable(s) from the headphone jack to the TV.
Steve