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Instructions Lenovo, Modèle ThinkPad L420 (7826)

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To launch the Display Properties window, refer to the “Solution” for “The Extend desktop function does not work” above. • Problem: The screen position on the external monitor is incorrect when that monitor is set for a high resolution. Solution: Sometimes, when you use a high resolution such as 1600x1200, the image is shifted to left or right on the screen. To correct this, first make sure that your external monitor supports the display mode, that is, the resolution and the refresh rate, that you have set. If it does not, set a display mode that the monitor supports. If it does support the display mode you have set, go to the setup menu for the monitor itself and adjust the settings there. Usually the external monitor has buttons for access to the setup menu. For details, see the reference manual for the monitor. Audio problems • Problem: Wave or MIDI sound does not play correctly. Solution: Make sure the built-in audio device is configured correctly. For Windows 7 and Windows Vista: 1. Click Start . Control Panel. 2. Click Hardware and Sound. 3. Click Device Manager. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. 4. Double-click Sound, video and game controllers (in Windows Vista, click the + mark for Sound, video and game controllers. 5. Make sure the following device is enabled and configured correctly: – Realtek High Definition Audio For Windows XP: 1. Click Start . Control Panel. 2. Click Performance and Maintenance 3. Click System. 4. Click the Hardware tab, and then click the Device Manager button. 5. Click the + mark for Sound, video and game controllers. 6. Make sure the following device is enabled and configured correctly: – Realtek High Definition Audio • Problem: Recordings made by using the Microphone input are not loud enough. Solution: Make sure that Microphone Boost is turned on and set as follows: For Windows 7 and Windows Vista: 1. Click Start . Control Panel. 2. Click Hardware and Sound 3. Click Sound. 4. Click the Recording tab in the Sound window. 5. Select Microphone, and click the Properties button. 176 User Guide 6. Click the Levels tab, and move the Microphone Boost slider upwards. 7. Click OK. For Windows XP: 1. Double-click the volume icon in the task bar. The Volume Control window opens. 2. Click Options. 3. Click Properties. 4. Select Realtek HD Audio input in the Mixer device list. 5. Click OK. 6. Click Options, and then click Advanced Controls. 7. Find the Microphone volume control, and then click Advanced. 8. Select the Microphone boost check box. 9. Click Close. Notes: – The names of windows or fields are slightly different depending on the operating system you use. – For details about controlling volume, refer to your Windows online help. • Problem: A volume or balance slider cannot be moved. Solution: The slider might be grayed out. This means that its position is fixed by the hardware and cannot be changed. • Problem: The volume sliders do not stay in place when some audio applications are used. Solution: It is normal for the sliders to change position when certain sound applications are used. The applications are aware of the Volume Mixer window (in Windows XP, Volume Control window) and are allowed to change the settings themselves. An example is the Windows Media Player. Usually the application has sliders available to control the sound from within the application. • Problem: The volume sliders do not all fit in the Volume Control window in Windows XP. Solution: Press Ctrl+S keys while the volume control is in focus, and toggle to a smaller size. • Problem: The balance slider cannot completely mute one channel. Solution: The control is designed to compensate for minor differences in balance and does not completely mute either channel. • Problem: There is no volume control for MIDI sound on the Volume Mixer window (in Windows XP, Volume Control window). Solution: Use the hardware volume control. In Windows XP, use the hardware volume control or the Wave volume control on the Volume Control window. This is because the Built-In Synthesizer Software does not support the control. • Problem: The sound cannot be turned off completely even if you set the Master volume control at minimum. Solution: You can still hear some sound even though you have set the Master volume control at minimum. To turn off the sound completely, go to the Master volume control and select Mute speakers (Mute in Windows Vista and Windows XP ). Chapter 10. Troubleshooting computer problems 177 Fingerprint reader problems • Problem: The surface of the reader is dirty, stained, or wet. Solution: Gently clean the surface of the reader with a dry, soft, lint-free cloth. • Problem: The reader often fails to enroll or authenticate your fingerprint. Solution: If the surface of the reader is dirty, stained, or wet, gently clean the surface of the reader with a dry, soft, lint-free cloth. If your finger has any of the following conditions, you may no...