English EnglishEnglishEnglishEnglishEnglishEnglish123 Put the ball back and replace the cover.To clean an optical mouseFor users of an optical mouse, refer to the documentation that came withyour mouse for maintenance instructions.To clean your monitorMake sure that you keep your screen clean. For cleaning instructions, referto 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• If a computer problem persists even after you have checked and appliedthe troubleshooting tips discussed in the "Frequently asked questions"section on page 9• If your problem is not listed in the "Frequently asked questions" sectionon page 9• If you want to replace or upgrade any of your computer's internalcomponentsAsking for technical assistanceFor technical assistance, contact your local dealer or distributor. You mayalso access the Web site (http://global.acer.com/support/index.htm) forinformation on how and where to contact the service centers available inyour area.