Hi everyone! I am new in this forum, but looks like here have really interesting information about Windows 7. So I really like windows 7, I will stay and this forum. And thanks all for great work. So about the problem: I have Dell Latitude XT and Windows 7 installed on it. When PC is a/c connected, I close the lid for like 10 minutes and after I open it, screen it`s darker, when I try get it brighter, nothing works, then I can restart PC and only then normal brightness returns. Where should be problem and where should I look for solution? Thanks, Janis!