Computer hardware uses a series of simple beep codes to notify users of a potential issue or problem. Many Dell XPS laptop power supplies are also capable of communicating in this manner. While not all computer beep codes indicate a critical issue, a beeping power supply is serious and means that the AC adapter might be on its last legs.
A beeping power supply indicates that something is not functioning correctly within the AC adapter. If the power supply is still able to power the laptop on, than the beep can indicate the power supply is experiencing overheating or voltage surges. If the laptop is not able to power on, than a beeping power supply strongly indicates that the adapter has suffered a critical fault and is not supplying electricity to the computer. In either case, the beeping means that the power supply is in a state of failure and must be replaced.
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There are a number a reasons a power supply can fail. As a power supply ages, heat and usage break down the internal electrical components until eventually the adapter is unable to function. Power surges or liquid damage can also cause failure, as can manufacturing defects that may take up to a year to manifest. In addition, if the supply's electrical cord is damaged, bent or crushed, the internal wires may be creating an electrical short, which prevents the adapter from working.
In most cases, Dell should be able to provide a replacement power supply compatible with your specific Dell XPS laptop model. A failed laptop power supply is generally covered under Dell's manufacturer warranty unless the supply has been damaged by water or misuse. Contact Dell technical support for more information on replacing the adapter (link in Resources). If Dell no longer carries the required adapter, or it is not covered under warranty, you can purchase a generic power supply from most electronics stores. Check that the generic adapter's power jack fits correctly into the laptop's plug; the correct jack should plug easily into the laptop. Never force or modify the jack to fit as it could damage the laptop's internal plug.
Replace a failing power supply as soon as possible as it may surge and damage the laptop's internal components. Do not attempt to repair a failing power supply at home. An AC adapter can retain an electric charge even after being unplugged for extended periods; if opened, the power supply can discharge and cause severe injury or death.