If you mean that smoke is coming from the equipment, it's time to unplug it and get it serviced. This typically means that a component has failed - it can usually be identified because it will be physically deformed. You might see a crack in an IC, a burned resistor, or something similar. Often, though not always, the component that failed may not be the only defective component on the board - for example, a voltage regulator may fail, but it might be due to a faulty capacitor, or some other short-circuit on the board. It's best to refer the repair to someone who is skilled in troubleshooting.
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