If the power light is off, the computer is either turned off or is not receiving peason. Reseat the power cable into both the power connector on the back of the computer and the electrical outlet. If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and that the power strip is turned on. Bypass power protection devices, power strips, and power c# winform numeric textbox
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on properly. Ensure that the electrical outlet is working by testing it with another device, such as a lamp. Ensure that the main power cable and front panel cable are securely connected to the system board (see System Board Components ). If the power light is blinking amber, the computer is receiving electrical power, but an internal power problem may exist.