Why is my car radio on but no sound?
Check each set of wires and speakers to be sure no wire or lead is connected to a chassis ground. The radio will see this as a short and turn off the internal amplifier causing the on but no sound issue. Each speaker connected to the radio needs dedicated positive and negative leads from the radio to each speaker.
Why did my speakers suddenly stop working?
Hardware problems can be caused by outdated or malfunctioning drivers. Make sure your audio driver is up to date and update it if needed. If that doesn’t work, try uninstalling the audio driver (it will reinstall automatically). If that doesn’t work, try using the generic audio driver that comes with Windows.