Hi All, My trusty early 2006 1.83GHZ 17" Intel core duo iMAC has (for the first time ever) a fault. It has developed a vertical line all the way down the screen - always in the same position: My desktop is plain black.. and the line shows up as having a yellow colour. It covers the whole of the screen. I tried switching the machine off and on again! but no change. Any suggestions please? Thanks.