Lenovo Yoga 500-15IBD Laptop (English) User Guide - Yoga 500 series - Page 39

Chapter 4. Troubleshooting The computer does not return from sleep mode, and the computer does not work. Display panel problems The screen is blank. The screen is unreadable or distorted. Incorrect characters appear on the screen. Sound problems No sound can be heard from the speakers even when the volume is turned up. • If your computer is in sleep mode, connect the AC power adapter to the computer, then press the Power button. • If the system still does not return from sleep mode, stops responding, or cannot be turned off, reset the computer. Unsaved data may be lost. To reset the computer, press and hold the Power button for five seconds or more. If the computer is still not reset, remove the AC power adapter. • Do the following: - If you are using the AC power adapter or the battery pack, and the battery status indicator is on, press F12 ( ) to make the screen brighter. - If the power indicator is blinking, press the Power button to resume from sleep mode. - Press F9 ( ) to confirm whether the backlight of the LCD screen has been turned off. - If the problem persists, follow the solution in the next problem "The screen is unreadable or distorted." • Make sure that: - The screen resolution and color quality are correctly set. - The monitor type is correct. • Is the operating system or programs installed correctly? If they are installed and configured correctly, have the computer serviced. • Make sure that: - The Mute function is off. - The combo audio jack is not being used. - Speakers are selected as the playback device. 33