The problem has only just appeared . We are running XP home , there is a black pencil thin line vertically in the centre of the screen about 5cm long , it is about 15cm below the top. To the right of this and lower down is another line only 2-5cm also vertical. Now here is the weird thing ( well to me anyway ) is that this fault only appears on the Desktop , Changing the wall paper picture has no effect. I have tried everything I can think of with settings and appearance to no no avail . Any ideas at all would be appreciated .