Movie rig help.

[Hardass]

I am going to install a BR/HD-DVD player in my daughters rig. Have a DVI to HDMI cable to hook to her plasma tv. Now, can I have the comp monitor cable and the dvi hooked up at the same time? also audio, she has a set of Logitech 5.1 speakers hooked to rig, how do I run audio to TV? I have a movie rig of my own, but it is hooked directly to my tv so not sure how to do one hooked to monitor and a tv. Thanks for any help here.