UPDATE: hey guys, I noticed a couple people have been looking at the thread, but no input yet. The imac turns on, but the screen flashes and powers off. The lcd is fine, and it powers up so thats a plus even though its only powered on for a short period of time. I just simply want to run my 360 to the imac, but the mobo is fried, so the vga input isnt going to work correct? if you can help at all please let me know.