Okay, the power comes into the plug, Dc jack, on the back or the side of the computer, which connects it to metal traces inside the mainboard of the computer. These will be connected to voltage regulators which often output 5 volts, 12 volts, 3.3 volts, and the CPU voltage. When you drop your laptop or the DC jack itself gets broken, no power goes to the motherboard and your laptop would not start.
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in section "Fixing of computers"
View also services categories "Computers repair and upgrade"