Log on to your laptop and locate the “Ctrl” and “Alt” keys. These keys are located at the bottom of the keyboard, near the space bar.
Hold the “Ctrl” and “Alt” keys down at the same time. Make sure both keys are depressed.
Press the right arrow to rotate the notebook screen 90 degrees to the right. Press the left arrow key to rotate it 90 degrees to the left. Pressing the up arrow will flip the screen upside down, while pressing the down arrow will restore it to its normal position.
Read more: How to Rotate a Notebook Screen | eHow.com