Acer 1620 Series My external microphone does not work., I can't eject the optical drive tray with my computer turned off., The keyboard does not respond., The optical drive cannot read a disc.

Troubleshooting
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control icon on the taskbar. If it is crossed-out, click on the icon
and deselect the Mute option.
• The volume level may be too low. In Windows, click on the volume
control icon on the taskbar, and then use the slider control to
increase the volume level.
• If headphones are connected to the headphone jack on the
computer, your computer's built-in speakers will be turned off.
My external microphone does not work.
Check the following:
• Make sure that the external microphone is properly plugged into
the microphone-in jack on the computer.
• Make sure that the volume is not muted or set too low.
I can't eject the optical drive tray with my computer turned off.
The computer needs to be turned on for the optical drive eject button
to function. If you need to eject the optical drive tray when the
computer is turned off, push a straightened paper clip into the optical
drive emergency eject hole. See “Emergency ejection of the optical
drive tray” on page 23 for more information.
The keyboard does not respond.
Try attaching an external USB keyboard to one of your computer's USB
ports. If it works, the internal keyboard might have become
disconnected. Contact your dealer or an authorized service center.
The optical drive cannot read a disc.
Check the following:
• Make sure that the disc is supported by the drive. If your computer
has a CD-ROM drive, it can read CDs but cannot read DVDs. If your
computer has a DVD drive, it can read both CDs and DVDs.
• When placing a disc in the drive tray, make sure that it is secure on
the spindle of the drive tray.
• Make sure that the disc is free from scratches or smudges. If the
disc is dirty, clean it using a disc cleaning kit.
• If the disc is OK, the drive head might be dirty. Clean it using a
drive head cleaning kit.