62 Solving ProblemsNo sound from headphonesVideo and Monitor ProblemsCAUTION: Before you perform any of the procedures in this section, follow the safety instructions in the ProductInformation Guide.NOTE: See the monitor documentation for troubleshooting procedures.The screen is blankDI S C O N N E C T H E A D P H O N E S F R O M T H E H E A D P H O N E C O N N E C T O R — Sound from the speakers isautomatically disabled when headphones are connected to the computer’s front-panel headphoneconnector.TE S T T H E E L E C T R I C A L O U T L E T — Ensure that the electrical outlet is working by testing it with anotherdevice, such as a lamp.EL I M I N A T E P O S S I B L E I N T E R F E R E N C E — Turn off nearby fans, fluorescent lights, or halogen lamps tocheck for interference.RE I N S T A L L T H E S O U N D D R I V E R — See "Reinstalling Drivers" on page 71.RU N T H E HA R D W A R E TR O U B L E S H O O T E R — See "Resolving Software and Hardware Incompatibilities"on page 72.CH E C K T H E H E A D P H O N E C A B L E C O N N E C T I O N — Ensure that the headphone cable is securely insertedinto the headphone connector (see "Front View of the Computer" on page 13).AD J U S T T H E WI N D O W S V O L U M E C O N T R O L — Click or double-click the speaker icon in the lower-rightcorner of your screen. Ensure that the volume is turned up and that the sound is not muted.CH E C K T H E M O N I T O R C A B L E C O N N E C T I O N —• Ensure that the monitor cable is connected as shown on the setup diagram for your computer.• Remove any video extension cables and connect the monitor directly to the computer.• Swap the computer and monitor power cables to determine if the power cable is defective.• Check the connectors for bent or broken pins (it is normal for monitor cable connectors to have missingpins).
