ctrl+alt+down arrow

ctrl+alt+down arrow:

Use windows graphic options to rotate system display.
* Right click on desktop.
* Pick Graphic Options -> Hot Key -> Enable.

Try the following to rotate:

Press Ctrl+Alt+Down Arrow to rotate your system display in 180_o.

To revert back to original position press Ctrl+Alt+Up Arrow.

Press Ctrl+Alt+(Right/Left) Arrow to rotate in right angle direction.