Lenovo 20JD, User Manual, Page: 101 / 150

– Press the power button to resume the computer from sleep or hibernation mode.
• Problem : The screen is blank.
Solution : Do the following:
1. Press the display-mode switching key to bring up the image.
2. If you are using the ac power adapter, or using the battery and the battery gauge shows that the
battery is not depleted, press the brightness-up key to make the screen brighter.
3. If your computer is in sleep mode, press Fn to resume the computer from sleep mode.
4. If the problem persists, follow the solution for the following problem.
• Problem : The screen is unreadable or distorted.
Solution : Ensure that:
– The display device driver is installed correctly.
– The screen resolution and color quality are correctly set.
– The monitor type is correct.
To check these settings, do the following:
1. Right-click on the desktop, and click Display settings ➙ Advanced display settings .
Note: If your computer cannot detect the external monitor, click Detect in the Display window.
2. Select the external monitor and set Resolution .
3. Click Display adapter properties .
4. Click the Monitor tab. Check the monitor information to make sure that the monitor type is correct. If
it is, click OK to close the window; otherwise proceed with the following steps.
5. If more than two monitor types are displayed, select Generic PnP Monitor or Generic Non-PnP
Monitor .
6. Click Properties . If you are prompted for an administrator password or confirmation, type the
password or provide confirmation.
7. Click the Driver tab.
8. Click Update Driver .
9. Click Browse my computer for driver software , and then click Let me pick from a list of device
drivers on my computer .
10. Clear the Show compatible hardware check box.
11. Select the correct manufacturer and model for the external monitor. If you cannot find your monitor
on the list, stop the installation of this driver and use the driver shipped with your monitor.
12. After updating the driver, click Close .
• Problem : Incorrect characters are displayed on the screen.
Solution : Ensure that you install the operating system and program correctly. If the problem persists,
have the computer serviced.
• Problem : I try to turn off my computer but the screen stays on and I cannot completely turn off my
computer.
Solution : Press and hold the power button for four seconds or more to turn off the computer.
• Problem : Missing, discolored, or bright dots appear on the screen every time I turn on my computer.
Solution : This is an intrinsic characteristic of the TFT technology. Your computer display contains
multiple thin-film transistors (TFTs). Only a very small number of missing, discolored, or bright dots
on the screen might exist all the time.
Chapter 7
.
Troubleshooting computer problems
85