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Yellow light at mains inlet on when computer switched of and mains disconnected

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  • bernard-wats Sep 21, 2008

    maybe I misled its a hp laptop .Only been learning six week.bernard-wats

  • bernard-wats Sep 22, 2008

    problem solved .thanks for help.esp BigFatGeek.Bernard-Watso

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I am not sure exactly what is meant by mains inlet. However if you mean that you disconnect the power from the computer after it has been turned off and and there is a light on the computer indicating power is coming to the computer, there is a perfect explanation for this.

Your power supply in your computer, along with your computer's motherboad both have capacitors on them. Capacitors hold electrical current. They are placed in the path of electrical current so that when an electrical current passes through a capacitor if the electrical current is too strong it stores some of that current in the capacitor. If the electrical current is too weak it provides the needed amount of current. So basically a capacitor serves to equal out an electrical current when needed. The capacitors in a power supply are pretty big (about the size of a D Cell battery), and hold alot of charge. Infact it is never a good idea to touch one of these large capacitors cause they will release their charge into you, and they can be quite dangerous.

I said all that to say this: When you unplug your computer those capacitors can still supply a little bit of electricity to your motherboard and cause your computer to show that it is still receiving power. It is perfectly alright for this to happen.

I do believe that this may have been what you are referring to, I hope this helps to answer your question.

Posted on Sep 20, 2008

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