Lenovo T420 User Manual

Lenovo

Chapter 10. Troubleshooting
computer problems . . . . . . . . .

201

Diagnosing problems . . . . . . . . . . . .

Troubleshooting . . . . . . . . . . . . . .

Computer stops responding

Spills on the keyboard . . . . . . . . . .

. . . . . . . . . . . .

Errors without messages . . . . . . . . .

Beep errors . . . . . . . . . . . . . .

Memory problems . . . . . . . . . . .

Modem and networking . . . . . . . . .

Keyboard and other pointing devices . . . .

Display and multimedia devices . . . . . .

Fingerprint reader problems. . . . . . . .

Battery and power . . . . . . . . . . .

Drives and other storage devices

Software problems . . . . . . . . . . .

Ports and connectors . . . . . . . . . .

Universal Serial Bus problems . . . . . . .

A docking station or port replicator
problem . . . . . . . . . . . . . . .

Chapter 11. Getting support . . . .

233

Before you contact Lenovo . . . . . . . . . .

Register your computer . . . . . . . . .

Download system updates . . . . . . . .

Record information . . . . . . . . . . .

Getting help and service . . . . . . . . . . .

Using diagnostic programs . . . . . . . .

Lenovo Support Web site. . . . . . . . .

Calling Lenovo . . . . . . . . . . . . .

Purchasing additional services . . . . . . . .

Appendix A. Regulatory
information . . . . . . . . . . . . .

237

Wireless related information . . . . . . . . .

Location of the UltraConnect wireless
antennas . . . . . . . . . . . . . . .

Locating wireless regulatory notices . . . .

Export classification notice . . . . . . . . . .

Electronic emission notices. . . . . . . . . .

Federal Communications Commission
Declaration of Conformity

. . . . . . . .

Industry Canada Class B emission compliance
statement . . . . . . . . . . . . . . .

European Union - Compliance to the
Electromagnetic Compatibility Directive . . .

German Class B compliance statement . . .

Korea Class B compliance statement . . . .

Japanese VCCI Class B statement . . . . .

Japan compliance statement for products
which connect to the power mains with
rated current less than or equal to 20 A per
phase . . . . . . . . . . . . . . . .

Lenovo product service information for
Taiwan . . . . . . . . . . . . . . . .

Additional regulatory information

Appendix B. WEEE and recycling
statements . . . . . . . . . . . . .

245

Important WEEE Information . . . . . . . . .

Battery recycling information for Japan . . . . .

Battery recycling information for Brazil . . . . .

Battery recycling information for Taiwan . . . . .

Battery recycling information for European
Union . . . . . . . . . . . . . . . . . .

Battery recycling information for United States and
Canada . . . . . . . . . . . . . . . . .

Appendix C. Notices. . . . . . . . .

249

Trademarks . . . . . . . . . . . . . . . .

Appendix D. Restriction of Hazardous
Substances Directive (RoHS) . . . .

251

China RoHS. . . . . . . . . . . . . . . .

Turkish RoHS . . . . . . . . . . . . . . .

Ukraine RoHS . . . . . . . . . . . . . . .

India RoHS . . . . . . . . . . . . . . . .

© Copyright Lenovo 2011

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