18English To clean your pointing deviceTo clean your mouse (with rubber ball)1 Open the circular cover underneath the mouse.2 Take out the rubber ball and wipe it with a soft, damp cloth.3 Put the ball back and replace the cover.To clean your optical mouseFor users of an optical mouse, refer to the documentation that camewith your mouse for maintenance instructions.To clean your monitorMake sure that you keep your screen clean. For cleaning instructions,refer to the documentation that came with your monitor.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 assistanceFor technical assistance, contact your local dealer or distributor. Youmay also access the acer web site (www.acersupport.com) forinformation on how and where to contact the service centers availablein your area.