Acer AcerPower SP - Manual (Page 21)

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3) Put the ball back and replace the cover.
To clean your optical mouse
For users of an optical mouse, refer to the documentation that came with your
mouse for maintenance instructions.
To clean your monitor
Make sure that you keep your screen clean. For cleaning instructions, refer to the
documentation that came with your monitor.
5.3 When to contact a service technician
If you dropped and damaged the computer.
If liquid has been spilled into the computer.
If the computer is not operating normally.
Asking for technical assistance
For technical assistance, contact your local dealer or distributor. You may also
access the Acer Web site (www.acersupport.com) for information on how and
where to contact the service centers available in your area.