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''As a general rule of thumb +/-5% is considered OK for voltage variation.''You can use any of the black "ground" wires. There is a single green wire you must use for the jumper. While the jumper is connected the power supply should turn on and it will remain on as long as the jumper is connected. Once the jumper is removed then the power supply will turn off.== Power Connector List With Introduction Chronology ==== Additional Charts and Data == === Power Connector List With Introduction Chronology === === Connector Picture Chart ===[[Image:Connector-Picture-Chart.jpg]] === Inside the ATX Power Supply ===[[Image:PowerSupplyVoltageDataforPersonalComputers16.png]]The power supply can be fully discharged by connecting the black and red wires together. == Front Panel Header Connectors ==The most common question might be, which is positive, the white or the colored wire? For the LED connectors, the colored wire is usually indicative of a positive polarity. + colored wire - white[[Image:mobofrontpanelconnectors01.jpg]]For the power LED indicator, insert the connector with the colored wire into the header with the '+' mark. If you've connected it the other way around, you won't see the LED light up when the system is powered. Also observe the proper polarity when connecting the hard drive LED connector.[[Image:mobofrontpanelconnectors02.png]]For the power switch connector, polarity isn't really important. The same holds true for the reset connector. When you connect the speaker, you should observe proper polarity. Some motherboards have built-in buzzers and as such, the speaker connection is not needed. + red - black