Lenovo P70 User Manual Download

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Boot problems

Print these instructions now and keep them with your computer for reference later.

If you receive an error message before the operating system loads, follow the appropriate corrective actions
for power-on self-test (POST) error messages.

If you receive an error message while the operating system is loading the desktop configuration after the
POST is completed, check the following items:

1. Go to the Lenovo Support Web site at

http://www.lenovo.com/support

and search for the error message.

2. Go to the Microsoft Knowledge Base homepage at

http://support.microsoft.com/

and search for the error

message.

Sleep and hibernation problems

•

Problem

: The computer enters sleep mode unexpectedly.

Solution

: If the microprocessor overheats, the computer automatically enters sleep mode to allow the

computer to cool and to protect the microprocessor and other internal components. Check the settings
for sleep mode.

•

Problem

: The computer enters sleep mode immediately after the power-on self-test.

Solution

: Ensure that:

– The battery is charged.

– The operating temperature is within the acceptable range. Refer to “Operating environment” on page

13.

If the battery is charged and the temperature is within range, have the computer serviced.

•

Problem

: A critical low-battery error occurs, and the computer immediately turns off.

Solution

: The battery power is getting low. Plug the ac power adapter into an electrical outlet and connect

the ac power adapter to the computer, or replace the battery with a charged one.

•

Problem

: The computer display remains blank after you press Fn to return from sleep mode.

Solution

: Check whether an external monitor was disconnected or turned off while the computer was in

sleep mode. If you disconnected or turned off the external monitor, connect it or turn it on before resuming
the computer from the sleep mode. When resuming the computer from the sleep mode without attaching
the external monitor or turning it on, and the computer display remains blank, press the display-mode

switching key

to bring up the computer display.

•

Problem

: The computer does not return from sleep mode, or the system status indicator blinks slowly and

the computer does not work.

Solution

: If the system does not return from sleep mode, it might have entered sleep or hibernation mode

automatically because the battery is depleted. Check the system status indicator.

– If the system status indicator blinks slowly, your computer is in sleep mode. Connect the ac power

adapter to the computer; then press Fn.

– If the system status indicator is off, your computer is in power-off state or hibernation mode. Connect

the ac power adapter to the computer; then press the power button to resume operation.

If the system still does not return from sleep mode, your system might stop responding and you might not
be able to turn off the computer. In this case, you need to reset the computer. If you have not saved your
data, it might be lost. To reset the computer, press and hold the power button for 4 seconds or more. If
the system is still not reset, remove the ac power adapter and the battery.

Chapter 8

Troubleshooting computer problems

101