User manual IBM THINKPAD A20P

[. . . ] Note Before using this information and the product it supports, be sure to read the general information under "Safety information" on page v and "Notices" on page 41. First Edition (January 2000) The following paragraph does not apply in the United Kingdom or any other country where such provisions are inconsistent with local law: INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION "AS IS" WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE LIMITED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimers of express or implied warranties in certain transactions; therefore, this statement may not apply to you. This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. [. . . ] If these connections are correct, disconnect the keyboard/mouse cable from the computer and make sure that the keyboard operates properly. If the built-in keyboard works, there is a problem with either the cable or with the keyboard. Try using a different keyboard/mouse cable or an external keyboard. Chapter 3. Solving computer problems 21 Hardware troubleshooting Standby or hibernation problems Problem The computer enters standby mode automatically. The computer enters standby mode immediately after POST (the standby indicator turns on). The critical low-battery error appears, and the computer immediately turns off. The LCD remains blank after you take action to return from a sleep mode. Cause and action If the processor reaches a temperature that is too high, the computer will automatically enter standby mode to allow the computer to cool and to protect the processor and other internal components. Make sure that: The battery pack is charged. The operating temperature is within the acceptable range. Refer to "Specifications" on page 4. If these items are correct, have the computer serviced. Connect the ac adapter to the computer, or replace the battery pack with a fully charged one. Check whether the external monitor was disconnected while the computer was in standby mode. Do not disconnect the external monitor while the computer is in standby mode or hibernation mode. If no external monitor is attached when the computer resumes, the LCD remains blank and output is not displayed. This restriction does not depend on the resolution value. The computer automatically enters standby or hibernation mode when the battery is depleted. Do one of the following: Replace the battery pack with a fully charged one and press Fn. Connect the ac adapter to the computer, and press Fn. The computer does not return from standby mode, or the standby indicator stays on and the computer does not work. 22 IBM ThinkPad A20 User's Reference Hardware troubleshooting Problem When you are using the port replicator, resuming normal operation from hibernation or standby mode takes a long time. Cause and action If the Ethernet port is enabled, but the port replicator is not connected to a network, resuming operation can take a long time. The computer queries the Ethernet until the timeout timer stops the query. If you want to access the Ethernet, connect the network cable. If you are not using the network, disable the Ethernet connector as follows: For Windows 98: 1. [. . . ] Any repairs of alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment. Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas. Caution Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate. The Ringer Equivalent Number (REN:0. 3) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface. [. . . ]