Power surge on the USB port: A USB device has exceeded power limits
A shorted USB cable, damaged peripheral port, or unpowered multi-port hub attempts to pull more than the 500mA (USB 2.0) or 900mA (USB 3.0) current limit, tripping the motherboard resettable polyfuse.
Internal desktop parts run on harmless 12V DC voltage and cannot shock you. Simply unplug the wall power cable first, then touch the unpainted metal case frame to ground static electricity.
Common Symptoms & Tells
- Notification toast: 'Power surge on the USB port : Unknown USB device needs more power than the port can supply'
- All USB ports on the front panel or rear bracket shut down simultaneously
- System shuts off USB power to prevent motherboard circuit board burning
Interactive Fix Checklist
0 of 4 steps completedUnplug all USB peripherals immediately
Disconnect every single USB device (flash drives, keyboards, mouse, webcams, RGB hubs). Click the 'Reset' button on the Windows error notification.
Inspect all USB ports with a flashlight for physical damage
Look inside every USB Type-A port. If the plastic center tab is broken and the 4 gold pins are touching each other or the metal outer housing, gently bend them apart with a wooden toothpick with the PC unplugged.
Switch to an externally powered USB hub
High-draw peripherals (like external hard drives, capture cards, and audio interfaces) should be plugged into an active USB 3.0 hub that has its own dedicated wall outlet AC power adapter.
Disconnect front-panel USB 3.0 header from motherboard
If the surge alert happens with nothing plugged into the case, disconnect the thick 19-pin blue USB 3.0 front-panel cable from the motherboard to isolate a defective case front I/O PCB.
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