Solutions:
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 speakers settings are not selected and none of the volume settings is set too low.
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 audio connectors on the computer. Most speaker cables are color-coded to match the connectors.
Ensure that the program you are running is designed for use on the Windows operating system. If the program is designed to run in DOS, the program does not use the Windows sound feature. The program must be configured to use Sound Blaster Pro or Sound Blaster emulation.
Ensure that the audio device drivers are correctly installed.
Solutions:
Ensure that the speaker cable is inserted completely into the connector on the computer.