User guide

Chapter 4. Troubleshooting
25
Incorrect characters appear
on the screen.
• Are the operating system or programs installed
correctly? If they are installed and configured
correctly, have the computer serviced.
BIOS password problems
I forgot my password. • If you forget your user password, you must ask the
system administrator to reset your user password.
• If you forget your HDD password, a Lenovo
authorized servicer cannot reset your password or
recover data from the hard disk. You must take your
computer to a Lenovo authorized servicer or a
marketing representative to have the hard disk drive
replaced. Proof of purchase is required, and a fee will
be charged for parts and service.
• If you forget your administrator password, a Lenovo
authorized servicer cannot reset your password. You
must take your computer to a Lenovo authorized
servicer or a marketing representative to have the
system board replaced. Proof of purchase
is required,
and a fee will be charged for parts and service.
Sleep problems
The critical low-battery error
message appears, and the
computer immediately turns
off.
• The battery power is getting low. Connect the AC
power adapter to the computer, or replace the battery
with a fully charged one.
The computer enters
sleep mode
immediately after Power-on
self-test (POST).
• Make sure that:
-The battery is charged.
-The operating temperature is within the acceptable
range. See “Chapter 2. Use and care Information” of
Lenovo Safety and General Information Guide.
Note: If the battery is charged and the temperature is within range, have the computer serviced.
The computer does not
return from sleep mode,
and the computer does not
work.
• If your computer is in sleep mode, connect the AC
adapter to the computer and then press any key or
the power button.
• If the system still does not return from sleep mode,
stops responding, or cannot be turned off, reset the
computer. Unsaved data may be lost. To reset the
computer, press and hold the power button for 4
seconds or more.