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A jumper is closed (on) if the cover is in place, connecting the two pins that make up the jumper; a jumper is open (off) if the cover is not in place.

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16y ago
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15y ago

it should be connected in the right configuration (see your power supply booklet or motherboard one) and the computer wont start anyway.

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Q: How can you tell if a jumper is on or off?
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