Lenovo ThinkPad Reserve Edition (English) Service and Troubleshooting Guide - Page 35
Computer screen problems
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Solving computer problems Problem: Solution: Problem: Solution: When you take action to return from sleep (standby) mode, the computer display remains blank. Check whether an external monitor was disconnected or turned off while the computer was in sleep (standby) mode. If you disconnected or turned off the external monitor, connect it or turn it on before resuming the computer from the sleep (standby) mode. When resuming the computer from the sleep (standby) mode without attaching the external monitor or turning it on, and the computer display remains blank, press Fn+F7 to bring up the computer display. Note: If you use the Fn+F7 key combination to apply a presentation scheme, press Fn+F7 at least three times in three seconds, and the image is displayed on the computer screen. The computer enters sleep (standby) mode unexpectedly. If the processor overheats, the computer automatically enters sleep (standby) mode to allow the computer to cool and to protect the processor and other internal components. Also, check the settings for sleep (standby) mode, using Power Manager. Computer screen problems Problem: Solution: Problem: Solution: 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. Missing, discolored, or bright dots appear on the screen every time you turn on your computer. This is an intrinsic characteristic of the TFT technology. Your computer's display contains multiple thin-film transistors (TFTs). A small number of missing, discolored, or bright dots on the screen might exist all the time. Chapter 3. Solving computer problems 25