For the past three weeks I've been connecting my laptop to an external LCD monitor and have had no problems until last night. As I was shutting down, I noticed on my extended a small blue box. At the time I thought it was some dead pixels or something and decided to sort it out in the morning. http://img440.imageshack.us/img440/4026/31350825kd8.jpg So today, I find the box gone but after I login it reappears. I also my desktops icons missing, that right clicking on the desktop didn't work, some USB devices didn't work (namely USB mouse), control panel wouldn't open, start menu key shortcut wouldn't work, Sophos anti-virus wouldn't open and after clicking shutdown, no dialog appeared to ask if I wanted to logoff, shutdown or restart but programs started exiting anyway and a problem occured during the explorers shutdown. So I turned it off manually, but when it came back everything was okay, but the box was still there. Clicking on it highlights it like an icon would and windows open up OVER it. A virus scan with Sophos came up clean. So what could this be? I'm using XP Pro SP2, by the way.