I use an Inspiron 6400 laptop that is approimately 2 years old. I can have it up and going just fine and at times I need to move the unit to another position and when I move it the screen will go blank. All the system lights are still on and I'ved tried everything I can think of to get video back to no avail. I have to turn the machine off then right back on and I have video again. Sure is a pain to have to start everything all over. Any ideas or suggestions?

Thanks in advance

mdland