Carefully check that the video cable connecting your monitor is securely inserted into the computer’s video output port and the monitor’s video input port. The first step is to check that all the relevant cables are properly plugged into the back of your computer and monitor/display device. How to Fix the PC Turns ON but No Display or Power to the Keyboard and Mouse Issue? Solution 1: Check Connections and Reset Cables Hardware failures: Damaged components, such as a malfunctioning motherboard or faulty USB ports, can cause power supply issues to peripherals.Overheating: Excessive heat within the system can trigger safety measures that disable certain components, including USB ports.BIOS settings: Incorrect BIOS configurations could lead to a lack of recognition or power distribution to connected devices.Power supply problems: Insufficient power or a failing power supply unit might cause peripheral devices to remain inactive.Driver issues: Outdated or corrupted drivers may hinder communication between the computer and peripherals.Faulty hardware connections: Loose cables or improperly connected peripherals can disrupt the power supply.Here are some potential triggers for the issue where the PC is on but doesn’t power the keyboard or mouse:
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