If your computer fails to start after unplugging the AC power cable or Power Supply Unit (PSU) and then plugging it back in, the problem might be related to the ACC (Accessory Charging Circuit) cable. The ACC cable is responsible for supplying power to peripherals, such as keyboards, mice, and USB devices, when the computer is off or in standby mode. In this article, we'll discuss the troubleshooting steps for reconnecting the ACC cable issues.
Understanding the ACC Cable and Its Function
The ACC cable, also known as the IEEE 1394 FireWire cable, is a 6-pin or 9-pin cable that connects the computer to the power supply and peripherals. The cable consists of five wires: +12V, Ground, +5V, Ground, and Data. The +12V and Ground wires provide power to the peripherals, while the +5V and Ground wires power the motherboard and other components when the computer is off or in standby mode.
Checking the ACC Cable Connection
The first step in troubleshooting the reconnecting ACC cable issue is to check the cable connection. Ensure that the ACC cable is securely connected to the power supply and the computer. You can identify the ACC cable by the 6-pin or 9-pin connector. The connector on the power supply is usually labeled as "ACC."
Checking the Power Supply
If the ACC cable is not connected to the power supply, try reconnecting it. If the problem persists, check the power supply unit (PSU) for any visible damage, such as cracks or melting. If you find any damage, replace the power supply. If the power supply is working correctly, move on to the next step.
Checking the Motherboard
If the ACC cable is connected to the power supply and the computer, but the computer still doesn't start, check the motherboard for any visible damage. Look for any burnt components, bent pins, or loose connections. If you find any damage, consult a professional technician for assistance.
Testing the ACC Cable
If the motherboard and power supply are working correctly, try testing the ACC cable using an ohmmeter. Disconnect the ACC cable from the power supply and the computer. Touch the ohmmeter's probes to the corresponding pins on the ACC cable. The resistance should be close to zero ohms for the +12V and Ground wires and around 1-2 kOhms for the +5V and Ground wires. If the readings are out of range, replace the ACC cable.
Replacing the ACC Cable
If the ACC cable is damaged or faulty, replace it with a new one. You can purchase a new ACC cable from the computer manufacturer or a trusted electronics retailer. Ensure that the new cable is compatible with your computer and power supply.
- Check the ACC cable connection to the power supply and computer.
- Inspect the power supply for any visible damage.
- Examine the motherboard for any visible damage.
- Test the ACC cable using an ohmmeter.
- Replace the ACC cable if it's damaged or faulty.