Sound devices not found?

hi i just plugged my speakers into my computer and i cant here nothing on anything it might be broke i dont know could you help? i also went to control panel ands and devices and it says no audio device and it wont let me change volume audio or voice does this mean its not working? thanks for any info i dont really know nothing about sounds on the computer.

Moving to General Hardware section…

Do you have a sound card or are you using the onboad audio of the motherboard?
You might not have the driver loaded for the sound to work. If you can find out the motherboard model, you can then go to the manufacturers web site and get the audio driver for your board.

Which OS??

Could be that the onboard sound is disabled in the BIOS!