Acer TravelMate 720 User Guide - Page 120
External microphone or audio line-in device does n...
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Frequently-Asked Questions External microphone or audio line-in device does not work. Check the following: u Make sure the external microphone or audio line-in device is connected to the line-in/microphone-in jack on the computer's rear panel. u If you cannot hear playback, the speakers may be muted. u Make sure the line-in/microphone-in jack is configured for the appropriate source. Run Notebook Manager and click on the Line-in/Microphone tab and set the input source correctly. Click on Apply to accept. I want to eject the CD-ROM tray without turning on the power. I cannot eject the CD-ROM drive tray. There is a mechanical eject button on the CD-ROM drive. Simply insert the tip of a pen or paperclip and push to eject the CD-ROM tray. 100 User's Guide