I have a 20" Imac (10.5.8 which has mini-dvi) which I have had for about 2-3 years. Last year I bought a 27" (10.6.7 which has a mini display port) is there any way to connect these and use the 20" as a second screen. If not what other ideas does anyone have that I could use the 20" for. Seems like a waste to sell it.