Mudshark 0 Newbie Poster

We have connected a G5 tower to a Compaq 17" flat screen and after a couple of minutes it runs slows and cant open any folders. Basically it hangs the hold system. I am not a Mac guru, I look after the windows network and help out the Mac team where I can, I need to know what settings I need to do for the video on the G5, cheers.