Lenovo ThinkPad T420 User Manual page 21

If your computer stops responding, and you cannot turn it off, press and hold the power switch for 4 seconds
or more. If the system is still not reset, remove the ac power adapter and the battery.
3 Fingerprint reader
Some models have a fingerprint reader. The fingerprint authentication technology enables you to use your
fingerprint to start the computer and enter the ThinkPad Setup.
For details, refer to the instructions in "Using a fingerprint reader" on page 97.
®
UltraNav
4 TrackPoint buttons
5 TrackPoint pointing stick
17
Touch pad
18 Touch pad buttons
The keyboard contains the unique TrackPoint
of a single process that you can perform without moving your fingers from typing position.
Move your fingertip across the UltraNav touch pad to move the pointer.
The TrackPoint and touch pad buttons provide functions similar to those of a mouse and its buttons.
6 ThinkVantage button
You can use the ThinkVantage
®
Rescue and Recovery
is hidden from it.
7 System and power-status indicators
Your computer has the system status indicators and the power status indicators. For the detailed information
about the location and meaning of each indicator, see "System-status indicators" on page 11 and
"Power-status indicators" on page 12.
8
UltraConnect™ wireless antennas (left)
13 UltraConnect wireless antennas (right)
The built-in antennas for the wireless communication are located at the top left and the top right portions of
your computer display.
For the specific locations of each antenna, refer to "Location of the UltraConnect wireless antennas" on
page 244.
9 Built-in microphone (left)
12 Built-in microphone (right)
The built-in microphone captures sound and voice when it is used with an application program capable
of handling audio.
10 Integrated camera
Some models have an integrated camera. By using this camera, you can take pictures or hold a video
conference.
For more information about how to use the camera, refer to "Using an integrated camera" on page 78.
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pointing device. Pointing, selecting, and dragging are all part
®
button to interrupt the startup sequence of your computer and start the
workspace, which runs independently of the Windows
®
operating system and
.
Chapter 1 Product Overview
3