Own a boutique and use iMac for business. Have the iMac connected to an LCD tv screen. Want to feature music videos (yahoomusic.com for example) on the LCD tv screen while doing general wok on the iMac. Also want the external tv monitor to be in "full screen". Ok, but when I do anything on the iMac, it goes back to regular screen. Is there a way to override this? So need your help! Angie