Acer TravelMate 720 User Manual page 120

Frequently-Asked Questions
External microphone or audio line-in device does not work.
Check the following:
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.
If you cannot hear playback, the speakers may be
muted.
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