Lenovo 20CD0033US manual Errors without messages

Solution: Cooling fan has failed. Have the computer serviced.

•Message: Thermal sensing error

Solution: The thermal sensor is not functioning correctly. Shut down the computer immediately and have the computer serviced.

Errors without messages

•Problem: My screen keeps blanking when I do not want it to.

Solution: Go the desktop and click the battery status icon from the Windows notification area. Then click More power options ➙ Show additional plans ➙ High performance.

•Problem: When I turn on the computer, nothing is displayed on the screen and the computer does not beep while starting up.

Note: If you are not sure whether you heard any beeps, turn off the computer by pressing and holding the power button for four seconds or more. Turn it on and listen again.

Solution: Ensure that:

–The battery is installed correctly.

–The ac power adapter is connected to the computer and the power cord is plugged into a working electrical outlet.

–The computer is turned on. (Turn the power button on again for confirmation.)

If a power-on password is set:

–Press any key to display the prompt for the power-on password. If the brightness level of the screen is low, increase it by pressing F6.

–Type the correct password and press Enter.

If these items are correctly set, and the screen remains blank, have the computer serviced.

•Problem: When I turn on the computer, only a white cursor is displayed on a blank screen.

Solution: If you have modified a partition on your hard disk drive by using partition software, information about that partition, or the master boot record might have been destroyed.

1.Turn off the computer, and then turn it on again.

2.If you still see only the cursor on the screen, do the following:

–If you have used the partition software, examine the partition on the hard disk drive by using the software, and recover the partition if required.

–If your system is installed with the Windows 8.1 operating system, use either the Remove everything and reinstall Windows function or the recovery discs to restore the system to the factory state.

If the problem persists, have the computer serviced.

•Problem: My screen goes blank while the computer is on.

Solution: Your screen saver or power management might have been enabled. Do either of the following:

–Touch the TrackPoint pointing device or the ThinkPad trackpad, or press a key to exit the screen saver.

–Press the power button to resume from sleep or hibernation.

84User Guide