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HP Pavillion Elite M9340F

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What is the red switch on the back of my HP Pavillion Elite M9340F be set at  150 or 230?

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Hello, it is the voltage selection of your power supply. You never need to change this, except if you want to use your PC in a country not using the same voltage of USA. 

If you want to use your PC in an other country, you need to search the correct voltage. If you make an incorrect choice in this switch and plug in your PC, your power supply will instantly dead. 

If I have been answer to your question please accept it as a solution 🙂
I am Expert from French Community, and I am doing my best to help you with your question.

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