The Computer Power Cord

Red: Represents the +5V power cable, used for powering devices such as the motherboard, memory, optical drives, and hard drives.

Yellow: Represents the +12V power cable, used for powering devices such as the CPU, graphics card, optical drives, and hard drives.

Orange: Represents the +3.3V power cable, mainly used for powering memory.

Purple: Represents the +5V standby power cable, used for providing power to a small part of the motherboard circuit after shutdown.

Blue: Represents the -12V power cable, used for powering serial port devices.

White: Represents the -5V power cable, used for powering the phase-locked data separation circuit of floppy drives.

Black: Represents the ground wire (0V), an essential part of the power supply loop.

Installation and maintenance of power supply cables

1. When installing, pay attention to the polarity of the plug, ensuring correct connection. For example, reset switches, power lights, hard drive lights, etc., all have specific colors and markings, connecting them incorrectly can cause devices not to work.

2. Regularly check the connection status of the power supply cables to ensure there is no loosening or damage.

3. For modular power supplies, power cables can be replaced or removed according to needs, making it convenient for customizing the case.

By understanding this information, you can better maintain and use computer power supply cables, ensuring the stable operation of the computer.

Wiring Instructions

Reset Switch: Two-pin. The plug for this switch is usually marked with "reset sw", while the corresponding pins on the motherboard are usually abbreviated as reset, rst, rs, or re. It does not matter which way around it is connected, it will work either way.

Power LED: The wiring is also a two-pin plug, one of which is usually green and the other white. When the computer's power is turned on, the power LED will light up. The plug for this switch is usually marked with "power led", while the corresponding pins on the motherboard are usually abbreviated as pw led, power led, pwr led, or pled+ and pled-. If it's connected backwards, it won't light up, just switch it around.

HDD LED: The HDD LED wiring is also a two-pin plug, with the two wires usually being one red and one white. When the hard drive is reading or writing, the HDD LED will light up. The plug for this switch is usually marked with "hdd led", while the corresponding pins on the motherboard are usually abbreviated as hdd led, hd, or ide_led+ and ide_led-. If it's connected backwards, it won't light up, just switch it around.

Speaker: This connection has a four-pin plug, but only two wires, usually red and black or orange and black. Once correctly connected, they are used for the case's speaker. The plug for this switch and the corresponding pins on the motherboard are usually marked with "speaker". Some computers will beep once when they start up normally, or make corresponding alarm sounds through the speaker if they cannot start properly, to help users troubleshoot. However, some motherboards already have a built-in speaker, in which case you don't need to connect the case's speaker.