My display suddenly went completely dark

Greetings, everybody.

I hope to find some help with my problem. I currently own a Dell Labreastude D505, a little less than two years old, and it runs Windows XP Home version. Several days ago I turned on my computer only to find a dark screen. However, by accident I shone a table lamp directly into the display and saw that the computer was fully started, only everything was extremely dark. I have tried adjusting the Control Panel, but to no avail. I have tried "Fn" + Up-Down arrow, and nothing. I can barely view the images on the screen, and only if I shine the light literally directly and closely to the screen. Other than that problem, everything else in the computer is working fine. DSL connection is running smoothly, all applications are operating as usual, and I have absolutely no error messages of any kind.

As usual, Microsoft help was useless, and so was Dell's. By the way, to clarify the matters, my laptop is stationery, staying primarily at the docking station, so it's not just screen dimming when unplugged. I have tried just about everything I could think about. Any help to resolve this issue is more than greatly appreciated.

Thank you in advance, Igor