How to Troubleshoot "No Audio Device Detected"by Jeffrey Ober
When working with a computer, errors will often appear related to an external device that you have connected to the computer. Many times the computer can detect the problem and can fix the error by itself. Sometimes, however, a user will need to intervene to determine why the problem happened and to fix the problem. Very often the problem was created by something a user did, so always pay attention to the last thing that happened to a computer when you are trying to fix it. If you get the message, "No Audio Device Detected," follow these guidelines to fix the problem.
Restart the computer. Yes, this sounds like a crazy idea, but with many computers today, one program or another can interfere with one another and restarting the computer will give the computer a chance to check for all the devices it needs to work and will often fix simple device problems.
Check your audio device plugs. If you have speakers, make sure that they are plugged in to the audio device on your computer and into a power source, if they have a power plug. Check to see that all the plugs are securely connected by unplugging them and plugging them back in.
Check your audio device interface card. Open up your computer case and look at the card that contains the plugs for your speakers or other audio device. Press down gently on the card to ensure that it is fully seated in the slot.
Check the drivers for your audio device. If your device came with an installation CD, insert that CD into your computer and re-install the drivers for the device. If you do not have a CD, go to the website of the manufacturer of your device and attempt to locate, download, and install the drivers for the device for your operating system.
Use an auto-detect service of your operating system. For example, with Windows, locate the "Add New Hardware" wizard in the control panel and let that software run. It will attempt to locate any devices and install drivers for those devices.