Lenovo ThinkPad T21 English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 41

Standby or hibernation problems

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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 standby or hibernation mode. The computer does not return from standby mode, or the standby indicator stays on and the computer does not work. 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 of the following: The battery pack is charged. The operating temperature is within the acceptable range. Refer to "Specifications" on page 5. If the battery charge and the temperature are acceptable, have the computer serviced. The battery power is getting low. 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. Connect the ac adapter to the computer, and press Fn. Chapter 3. Solving computer problems 25

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Hardware troubleshooting
Standby or hibernation problems
Problem
Cause and action
The computer enters
standby mode
automatically.
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.
The computer enters
standby mode
immediately after POST
(the standby indicator
turns on).
Make sure of the following:
±
The battery pack is charged.
±
The operating temperature is within the acceptable range.
Refer to
“Specifications” on page
5.
If the battery charge and the temperature are acceptable, have the
computer serviced.
The critical low-battery
error appears, and the
computer immediately
turns off.
The battery power is getting low. Connect the ac adapter to the computer,
or replace the battery pack with a fully charged one.
The LCD remains blank
after you take action to
return from standby or
hibernation mode.
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 does not
return from standby mode,
or the standby indicator
stays on and the
computer does not work.
The computer automatically enters standby or hibernation mode when the
battery is depleted.
Connect the ac adapter to the computer, and press
Fn.
Chapter 3.
Solving computer problems
25