Hi, I have a 21.5-inch Mid-2010 iMac running 10.9.2 with 12Gb of 1333 MHz DDR3 RAM, and ATI Radeon HD 4670 256 MB Graphics and 3.06 GHz Intel Core i3 Processor. Ive had this for about 3 and a half years. Some time back I noticed a ghost panel on the left side of the display. It lasted a few months but wasnt really that obvious. It was hardly noticeable and eventually disappeared. A few weeks ago I noticed another. This time it was a 65mm (2.5 inch) deep band running horizontally right across the screen just above the screen centre. These ghosts seemed to be very light grey and stayed in front (on top) of whatever was displayed. The new panel has become much darker and sometimes holds a memory of what was beneath it for 30 seconds or so. It also flashes and rolls sometimes but always within the same 65mm band which is always displayed in the same position. This panel is immediately obvious when the Mac boots up and shows up even before the apple logo on the grey screen. Ive tried to take an image of the panel but Grab captures what is beneath the grey area. Ive read somewhere that this would suggest that the graphics card is not the problem. Im wondering if it is the screen itself? Does anyone know what is happening and if I can fix it? I do not know if this is a hardware or software problem so apologies if I have posted in the wrong section. Thanks.