This error on an ASUS H81M-CT Go to product viewer dialog for this item. motherboard is a failsafe triggered when the system detects an electrical short or excessive power draw from a USB port . To protect the hardware from permanent damage, the motherboard automatically initiates a shutdown sequence within 15 seconds. Common Root Causes The issue is almost always hardware-related rather than a software bug: Bent USB Pins: Metal pins inside the USB ports (front or back) touching each other or the metal port housing. Faulty Front Panel Headers: Cheap or damaged front-case USB ports often develop internal shorts. Missing or Incorrect Jumper: If the USB power jumpers (often labeled USBPWR) on the motherboard are missing or in the wrong position, the board may misread current levels. Damaged USB Device: A failing mouse, keyboard, or unpowered USB hub drawing too much current. Motherboard Short: A metal standoff or the I/O shield touching the back of the motherboard near the USB solder points. Deep Troubleshooting Guide Perform these steps in order, testing after each one to isolate the fault. 1. Isolation Test (External) Unplug everything: Remove all USB devices (including keyboard and mouse). Wait and Reboot: Turn the PC off, unplug the power cord for 60 seconds, then try booting with zero USB devices connected. Result: If it boots, one of your external devices is faulty. Add them back one by one to find the culprit. 2. Inspect for Physical Shorts Visual Check: Use a flashlight to look into every USB port. Look for bent pins or debris (like metal shavings). I/O Shield: Ensure the small metal "fingers" of the rear I/O shield are not accidentally bent inside a USB port. 3. Internal Header Disconnection
The message "USB Device Over Current Status Detected" on an ASUS H81M-CT motherboard is a safety feature that triggers when the system detects a power surge or a short circuit in a USB port. To prevent hardware damage, the system will automatically shut down after 15 seconds. Quick Fixes & Troubleshooting Unplug All USB Peripherals : Disconnect every external USB device (keyboard, mouse, flash drives, etc.) and restart. If the PC boots normally, reconnect them one by one to find the faulty device. Check Physical Damage : Inspect the rear and front USB ports with a flashlight. Look for bent internal pins that might be touching the metal casing (grounding) or each other. Isolate Internal Headers : Often, the problem lies with the PC case's front USB ports. Open your case and disconnect the cables from the motherboard. Verify Jumpers : Ensure the jumpers on the motherboard are in the correct position (covering pins 1 and 2). A missing or incorrectly placed jumper can trigger this error. Reset the BIOS : Clear the CMOS by removing the motherboard battery for 5–10 minutes while the PC is unplugged. Advanced Repair If the error persists with nothing connected, it may indicate a failed sensing chip (HC) or a damaged protection component on the motherboard itself. In such cases, professional motherboard repair or replacement is usually required. Does your PC show this error even when is plugged into the external ports? How to fix over current detection on USB device? - Facebook
Decoding the "USB Device Over Current Status Detected" Error on ASUS H81M-CS (and H81M-CT) Motherboards For many PC builders and system administrators, the ASUS H81M series of motherboards represents a workhorse platform. Built on the reliable Intel H81 chipset, boards like the H81M-CS, H81M-C, and the H81M-CT have powered countless office computers, home servers, and budget gaming rigs for nearly a decade. They are known for their durability and "no-nonsense" functionality. However, even the most reliable hardware can throw a curveball. One of the most frustrating and confusing errors an owner of these boards can encounter appears right at the boot-up screen: "USB Device Over Current Status Detected!! System will shut down after 15 seconds." This message is not just a warning; it is an immediate death sentence for your current computing session. The system counts down and cuts power, leaving the user scratching their head. If you are currently staring at this message on your ASUS H81M-CT or similar variant, don't panic. This comprehensive guide will walk you through exactly what this error means, why it happens, and the step-by-step methods to diagnose and fix it, ranging from simple software tweaks to advanced hardware repairs.
Understanding the Error: What is "Over Current"? To solve the problem, we first need to understand the mechanism behind it. USB (Universal Serial Bus) ports operate on a standard voltage of 5V. By specification, a standard USB 2.0 port can deliver up to 500mA (0.5 Amps) of current, while USB 3.0 can deliver up to 900mA. The motherboard constantly monitors the power draw on these ports. When you plug in a device—be it a mouse, keyboard, or flash drive—the motherboard negotiates the power requirement. If a device attempts to draw more power than the port can safely supply, or if there is a short circuit within the device or the port itself, the motherboard’s built-in protection circuits kick in. This is where the "Over Current Status Detected" message comes from. The ASUS BIOS detects a voltage drop or a current spike that exceeds safety thresholds. To prevent damage to the motherboard, the CPU, or the power supply unit (PSU), the motherboard instructs the system to shut down immediately. In short: Your motherboard is doing exactly what it is designed to do—protecting itself from an electrical fire.
Step 1: The External Diagnosis (The "Unplug Everything" Method) Before you tear your computer apart or consider buying a new motherboard, you must rule out the simplest culprits. In 70% of cases involving the ASUS H81M platform, the issue is caused by an external peripheral, not the board itself. The Procedure:
Shut down the PC and switch off the PSU. Unplug every single USB device from the rear I/O panel and the front panel headers. This includes:
Keyboards and Mice USB Wi-Fi adapters Flash drives and External Hard Drives Printers and Scanners Crucially: Check for USB bluetooth adapters or dongles hidden behind the PC.
Attempt to boot.
Analyzing the Result:
If the PC boots successfully: Congratulations, the issue was a faulty peripheral. You can plug your devices back in one by one to identify the culprit. Often, a flash drive with an internal short or a low-quality USB Wi-Fi adapter drawing inconsistent power is to blame. If the error persists: If the system still shuts down with nothing plugged in, the issue is internal. You have a hardware or configuration fault within the PC case itself.
Step 2: Investigating Front Panel Headers If the rear I/O ports are clear, the next most common suspect is the front panel USB ports on your computer case. The ASUS H81M-CT has internal headers (JUSB1, JUSB2, etc.) that connect to the case's front ports using small cables. These ports are exposed to dust, debris, and physical damage much more often than the rear ports. Common Issues with Front Ports:
Debris Shorting: A stray piece of conductive material (like a loose screw, a bent paperclip, or accumulated dust) inside the front USB port can bridge the +5V pin to the Ground pin. This causes an immediate short circuit. Damaged Pins: If a cable was yanked out of the front port aggressively, the internal plastic housing might have cracked, bending the pins together.