Dell Alienware M15x Owner's Manual page 60

Game Controllers
The computer does not recognize the game controller
• Check that the cable connecting the game controller to the computer is not
damaged and that it is properly connected.
• Reinstall the device driver for the game controller.
Speakers
There is no sound from the speakers (external)
Ensure that subwoofer and the speakers are turned on:
See the documentation supplied with the speakers. If your speakers have volume
controls, adjust the volume, bass, or treble to eliminate distortion.
Adjust the Windows volume control:
Click or double-click the speaker icon in the lower-right corner of your screen.
Ensure that the volume is turned up and that the sound is not muted.
60 CHAPTER 6: TROUBLESHOOTING
Disconnect headphones from the headphone connector:
Sound from the speakers is automatically disabled when headphones are
connected to the headphone connector.
Test the electrical outlet:
Ensure that the electrical outlet is working by testing it with another device, such
as a lamp.
Reinstall the audio driver
Run the PSA Diagnostics
NOTE: The volume control in some MP3 players overrides the Windows
volume setting. If you have been listening to MP3 songs, ensure that you
did not turn the player volume down or off.