Modern motherboards require two separate power connections from the power supply: the 24-pin ATX connector for general motherboard power and a 4-pin or 8-pin CPU (EPS) connector dedicated to powering the processor. Failing to connect the CPU power connector commonly results in a system that does not boot and may display a critical or CPU-related error.
In this scenario, the user connected power to the motherboard, graphics card, and storage devices, but the system fails to start. This strongly indicates that the CPU power connector was overlooked, which is a frequent mistake during PSU replacement. Without this connection, the processor cannot initialize, preventing POST.

Cable modems use coaxial cable to connect to the wall jack, and the standard connector for coaxial cable in ISP cable installations is the F-type connector.

A network interface card provides the hardware interface required for a desktop computer to connect to a network and access the internet.

Consistently lower signal strength than other devices in the same environment indicates a hardware-related issue rather than general interference. A malfunctioning or damaged Wi-Fi antenna in the smartphone would reduce signal reception, leading to frequent disconnections, especially in environments with weaker or congested signals.

Projectors have air filters that prevent dust from entering the internal components. A clogged filter can cause the projector to overheat, resulting in shutdowns and even strange smells due to overheating components. Cleaning the filter is a standard troubleshooting step when projectors exhibit overheating symptoms.