Power Supply Cable
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For a laptop, can you replace just the power supply or do you have to replace the whole motherboard?
My wifes computer decided it was just going to stop turning on altogether a while back....I bought a new power supply cable hoping that this would solve the problem, but it was not the cable.....so this means that there is something wrong inside the laptop.....can I replace only the power circuitry stuff or do I need to just go get a replacement motherboard and start all over?
I am not sure what you mean by replacing the power supply cable... Did you replace the ENTIRE power supply (from where it plugs into the computer to where it plugs into the wall) ? You didn't mention the type of computer, but most power supplies have a Green LED on the power supply to indicate if it's on. Another way to check it is with a voltmeter. The output voltage is written on the label of the power supply.
There typically is no separate replaceable power circuit on the motherboard. YOu would have to replace the entire motherboard.
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