Broadcom Corporation BRCM1048 Manuel D’Utilisation

The critical low-battery error 
message appears, and the 
computer immediately turns off.

The battery power is low. Connect the AC adapter and run the 
computer on AC power.

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 the computer does not return from sleep mode, it may have 
entered hibernation mode automatically because the battery is 
depleted. Check the power indicator. 

If your computer is in sleep mode, connect the AC adapter to the 
computer, then press any key or the power button.

If your computer is in hibernation mode or power-off state, connect 
the AC adapter to the computer, then press the power button to 
resume operation.

Note:  If the system still does not return from sleep mode, your system has stopped responding, and you 

cannot turn off the computer; reset the computer. Unsaved data may be lost. To reset the computer, press 
and hold the power button for 4 seconds or more. If the computer still does not reset, remove the AC 
adapter.

The screen is blank. 

Do the following:
- If you are using the AC adapter, or using the battery, and the 

battery status indicator is on, press Fn + ↑ to make the screen 
brighter. 

- If the power indicator is in blinking, press the power button to 

resume from the sleep mode. 

- If the problem persist, follow the solution in the following problem 

“The screen is unreadable or distorted.”

- Press Fn+F2 to confirm whether the LCD screen has been turned 

off.

The screen is unreadable or 
distorted.

Make sure that: 
- The display device driver is installed correctly.
- The screen resolution and color quality are correctly set. 
- The monitor type is correct.

Incorrect characters appear on the 
screen.

Did you install the operating system or application program 
correctly? If they are installed and configured correctly, have the 
computer serviced.

No sound can be heard from the 
speaker even when the volume is 
turned up.

Make sure that:
- The Mute function is off.
- The headphone mic combo jack is not used.
- Speakers are selected as the playback device.