Lenovo 30BA User Manual

Also see for 30BA: Hardware Maintenance Manual

Contents

• The computer voltage matches the voltage available at the electrical outlet for your country or region.The operating system fails to start up.Solution:Ensure that the startup device sequence set in the Setup Utility program includes the device where theoperating system resides. Usually, the operating system is on the internal storage drive. For moreinformation, see “Changing the startup device sequence permanently” on page 41.The computer beeps multiple times before the operating system starts up.Solution:Ensure that no keys are stuck.Audio problemsThe audio cannot be heard on the Windows operating system.Solutions:• If you are using powered external speakers that have an On/Off control, ensure that:– The On/Off control is set to the On position.– The speaker power cable is connected to a properly grounded, functional ac electrical outlet.• If your external speakers have a volume control, ensure that the volume is not set too low.• Click the volume icon in the Windows notification area on the taskbar. Ensure that the mute speakerssettings are not selected and none of the volume settings is set too low.Note: If the volume icon is not displayed in the Windows notification area, add the icon to the notificationarea. See the Windows help system.• For some computers that have a front audio panel, ensure that the volume is not set too low.• Ensure that your external speakers (and headphones, if used) are connected to the correct audioconnectors on the computer. Most speaker cables are color-coded to match the connectors.Note: When external-speaker or headphone cables are connected to the audio connectors, the internalspeaker, if present, is disabled. In most cases, if an audio adapter is installed in one of the expansionslots, the audio function built into the system board is disabled. Therefore, you must use the audioconnectors on the audio adapter.• Ensure that the program you are running is designed for use on the Windows operating system. If theprogram is designed to run in DOS, the program does not use the Windows sound feature. The programmust be configured to use Sound Blaster Pro or Sound Blaster emulation.• Ensure that the audio device drivers are correctly installed.The sound comes from one of the external speakers.Solutions:• Ensure that the speaker cable is inserted completely into the connector on the computer.• Depending on your Windows version, do one of the following:– For Windows 7: Click the volume icon in the Windows notification area on the taskbar. Then, click thespeaker icon on top of the volume control.– For Windows 10: Right-click the volume icon in the Windows notification area on the taskbar. Then,click Open Volume Mixer and select the desired speaker.52 P720 User Guide