Question 67

The most likely forgotten power connection is 120V.

The issue of the PC failing to POST and shutting down after five seconds suggests a problem with power supply connections, particularly the main power connection to the motherboard. The 120V connection is essential for providing the necessary power to boot the workstation properly.

A) 5V

The 5V connection is typically used for low-power components and peripherals within the PC. While critical for certain functions, it would not cause the PC to fail to POST and shut down within seconds, making it an unlikely candidate for the forgotten connection.

B) 11V

There is generally no standard 11V power connection in typical PC power supplies. This option appears to be a misrepresentation, as power supplies usually provide 3.3V, 5V, 12V, and other voltages for specific components. Therefore, this option is irrelevant to the situation.

C) 120V

The 120V power connection is crucial for the operation of the power supply unit (PSU) and is responsible for powering the entire workstation. If this connection was forgotten during the installation, it would directly result in the symptoms described: the PC failing to stay powered on and not completing the POST process.

D) 220V

While 220V is a standard voltage in many regions, it is not applicable in this scenario if the workstation is designed for a 120V supply. Forgetting a 220V connection would be relevant only if the workstation were intended to operate on that voltage, which contradicts common configurations in areas where 120V is standard.

Conclusion

In conclusion, the 120V connection is essential for powering the workstation, and its omission would directly lead to the symptoms described. The other options either do not correspond to standard connections for this type of equipment or are irrelevant to the issue at hand, confirming that C is the correct answer.