Can someone offer advice on how to get rid of a small blot/image on my screen. It is rectangular, grey on outside with a smaller white rectangle in the middle. It is the size of a finger nail and won't move, even after several reboots. It doesn't respond to the curser or right or left clicking. I have tried Dell's support centre to no avail and have not found a topic on this in this forum. Please, I would really appreciate any advice you can give me, as this is the strangest thing. Thanks!
The first thing to do is attach an external monitor - it will tell you whether it's a faulty video card (the fault will show externally) or whether it's a faulty display panel.