I bought my 40 inch samsung lcd in nov of 2006,and about 6 months ago the screen got small grainy particals across the top and the middle of the screen this only was on the freeview channels,so i thought it was the digital box built into the t.v that was faulty,it didn't bother me too much as i have virgin media and the screen was fine on ext 2.But this has now started to happen on ext 2 and the hdmi channel but just with grainy particals across the top of the screen not the middle.I have also switched virgin media to ext 1 and have the same problem on that channel,but ext 2 is then fine. Any idea's what wrong with it anybody?