I have been trying to use my Sharp Aquos 32" display as my computer screen (not an extension) through an AVC system by connecting a mini displayport to hdmi cable to my 13" Macbook pro mid-2010 then to an HDMI input on the AVC box and then to the display. However when I go into system preferences and change my display resolution to 1080i ,which is the resolution of the TV screen, my desktop will pop up but it looks as if the screen is bouncing up and down between pixels. Although the highest resolution I have been able to get it to is 720i by changing the number of recent items to 10 in the display drop down menu and choosing 720i.