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I am the HP Certified Repair Tech for a high school that supports about 600 TC4400's. This issue does require you to replace the screen. What happens is the button board inside the screen that controls rotation gets stuck in the "rotate" position. Since its in the board itself there really isn't any way to get it unstuck without replacing the whole thing. I've had to replace about 20 screens out of 600, which isn't too bad, but its still a pain.
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