The image is actually clear as crystal, as always. What's strange too is that when the monitor tuns on there's a very short period of time where the screen turns darker (as dark as it should be while being off) and then turns on. But while being on all seems to be fine. I even tried looking at a black picture and all seems to be fine (no extra light anywhere)
And about the USB thing, the problem is that my USB external drive sometimes seems to make a short-circuit and that's why I was concerned about the USB thing because I even saw a little spark sometimes and I said, some other times all my USB devices turned off by the time I was connecting the external drive.
Thank you for your reply.
BTW: I've tried to take a picture of the screen, but the camera can't "see" that little background light.
Also I would like to add that not all the screen is equally lit while being off. The light is more intense on the bottom, slightly at the left side.