Acer TravelMate C310 Series User Manual page 38

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The right arrow (3 o'clock position) rotates the display output 90 degrees
•
clockwise. This changes the output from landscape to portrait or vice versa.
Press the icon as shown.
Note: If the Sleep indicator is off, the computer has entered
Hibernation mode and is turned off. If the power indicator is off
but the Sleep indicator is on, the computer has entered Sleep
mode. In both cases, press and release the power switch to turn
the computer back on. Note that the computer may enter
Hibernation mode after being in Sleep mode for a period of time.
Caution: Avoid packing items next to the top cover of the
computer. Pressure against the top cover can damage the screen.