It depends on what kind of outputs your video card has. Some just have just the standard, 15 pin VGA connector while other have video-S, DVI, or even HDMI.

Realize that Hulu probably isn't going to look as good on a 42" screen as it does on your computer monitor.

The PC IN input you referred to is most likely a "15 pin D-Sub", "VGA" or whatever you want to call it, it takes a standard PC monitor cable. Your computer will almost certainly have one of those. If not, then it should have either DVI or HDMI. I added a link below to a DVI->HDMI adapter that will work with any of the myriad of DVI ports that you might have. Once you have that, any HDMI cable will do. I'd recommend getting either the DVI or VGA cables at www.monoprice.com, they're good quality cables and the prices can't be beaten.

Here is a link that might be useful: DVI to HDMI adapter.