Lenovo M4350 Desktop - Manual (Page 39)

1. Remove the new hardware option or software. If you must remove the computer cover to remove a
hardware option, make sure you review and follow the electrical safety information provided with your
computer. For your safety, do not operate the computer with the cover removed.
2. Run the diagnostic programs to ensure your computer is operating correctly.
3. Reinstall the new hardware option or software following the manufacturer's instructions.
Select the problem your computer is experiencing from the following list:
• “Audio problems” on page 33
• “CD problems” on page 34
• “DVD problems” on page 35
• “Intermittent problems” on page 36
• “Hard disk drive problems” on page 37
• “Keyboard, mouse, or pointing device problems” on page 37
• “Monitor problems” on page 39
• “Networking problems” on page 40
• “Option problems” on page 43
• “Performance and lockup problems” on page 43
• “Printer problems” on page 45
• “Serial port problems” on page 45
• “Software problems” on page 46
• “USB problems” on page 46
Audio problems
Select your symptom from the following list:
• “No audio in Windows” on page 33
• “An audio disc or AutoPlay-enabled disc does not automatically play when it is inserted into a drive”
on page 34
• “Sound comes from one external speaker only” on page 34
• “No audio in DOS applications or games” on page 34
No audio in Windows
Symptom: No audio in Windows
Actions:
• If you are using powered external speakers that have an On/Off control, verify that the On/Off control is
set to the On position and the speaker power cable is connected to a properly grounded, functional ac
electrical outlet.
• If your external speakers have a volume control, verify that the volume control is not set too low.
• Double-click the speaker icon in the Windows notification area. A master volume-control window opens.
Verify that the Mute settings are not checked and none of the volume settings is set too low.
• Verify that your external speakers (and headphones, if used) are connected to the correct audio connector
on the computer. Most speaker cables are color-coded to match the connector.
Note: When external-speaker or headphone cables are attached to the audio connector, the internal
speaker, if present, is disabled. In most cases, if an audio adapter is installed in one of the expansion slots,
the audio function built into the system board is disabled; use the audio jacks on the adapter.
Chapter 4 . Troubleshooting and diagnostics 33