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 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.
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 a sleep 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. 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.
22 IBM ThinkPad A20 User's Reference
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