These safety instructions must be read carefully and fully understood before attempting to use your Laptop ac adapter.
1.Your HP EliteBook 8540W Laptop Charger may not power your Laptop due to a loose connector. Make sure all connectors are inserted correctly. Also, check the adapter box. High Power HP EliteBook 8540W Adapter often have an LED light that lights up when your adapter is powering your Laptop . If this light is off, then your Laptop is not receiving any power.
2.Make sure nothing is resting on your power cable such as a book, Laptop bag, or anything else that could pinch the adapter cable. If nothing is bending the cable, check the cable itself. The constant bending from storing your adapter could have exposed the wires within the adapter cable. This exposure can cause it to stop functioning properly.
3.If you find that your Cheap HP EliteBook 8540W AC Adapter is no longer working, there are a few options for replacing it. The first option is to order the same or a similar compatible adapter.
4. An HP EliteBook 8540W Laptop Adapter secondary function is to charge a computer battery. A full charging session takes around two hours or longer if you use the computer during that time. If the battery is completely dead, you may need to leave the adapter plugged in for a few minutes before you turn on the computer.
5. Avoid exposing HP EliteBook 8540W Laptop Adapter to prolonged periods of extreme heat or cold. Doing so could damage the internal circuitry and prevent it from working. Always wrap up the AC cord tightly when traveling, and avoid any contact with other metallic devices, like coins, pens or paperclips. These could accidentally short-circuit the adapter by causing an connection of the positive an negative terminals, for example, when bouncing around in a bag.
6. While it is normal for HP EliteBook 8540W Laptop AC Adapter to get warm to the touch while plugged in, any other signs of trouble may require immediate action.
7. If your adapter is making a high pitch noise, replace it. If your adapter stops working completely, it may be a sign of a bad transformer or a wiring issue. If you fancy yourself an amateur repairman, keep in mind that it is generally a bad idea to open up the AC adapter for any reason.

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