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The front panel connector is the place where the main board is used to connect the power switch, system reset, and hard disk power indicator on the chassis. This is a set of control lines. Generally speaking, the ATX structure has a main power switch (Power SW) on the chassis. It is a two-pin plug. Like the Reset connector, it is a short circuit when pressed and released. Open the way, click, the computer's main power is turned on, and then click to close. 
The two-wire connector of the hard disk indicator is red. On the motherboard, such pins are usually marked with the words IDE LED or HD LED. When connecting, the red line should be one. After this line is connected, when the computer is reading and writing the hard disk, the hard disk light on the chassis will light up. The power indicator is usually a two- or three-pin plug, using 1, 3, 1 line is usually green. The

On the main board, pins are usually marked as PowerLEDs. When connecting, note that the green line corresponds to the first pin (+). When it is connected, the computer turns on and the power light stays on, indicating that the power has been turned on. The reset connector must be connected to the reset pin on the motherboard. The function of the Reset pin on the motherboard is this: When they are short-circuited, the computer restarts. The PC speaker is usually a four-pin plug, but actually only uses 1, 4 two wires, the first line is usually red, it is connected to the motherboard Speaker pin. When connecting, note that the red line corresponds to the position of 1.