Activation of overcurrent protection (OCP)
Description
The source detected a dangerously high current draw on some of the lines (typically 12V) and immediately shut down the computer just to be safe.
Common Causes
- High peak consumption (transient spikes) of powerful graphics cards (e.g. RTX 3080/4090)
- Short circuit in some power cable or component
- Defective or weak source
Recommended Solutions
- Solution: Upgrade to a higher quality power supply (ATX 3.0 compatible)
- Solution: Test cables for damage
- Solution: Try undervolting the graphics card
Understanding Severity: Power Delivery Failures
Power Supply Unit (PSU) failures are highly critical because they affect voltage rails feeding sensitive components like the CPU and GPU. A PSU failing to deliver stable power will trigger protection circuits (OVP, OPP, SCP, OCP), causing instant black-screen shutdowns under 3D gaming loads or rendering tasks. Severe power ripples or over-voltage issues on the 12V, 5V, or 3.3V rails can permanently damage internal hardware. A reliable, clean power supply is essential to ensure hardware stability and prevent electrical component fires.
Safety & Prevention Guidelines
Never attempt to open the casing of a Power Supply Unit. The internal high-voltage capacitors store dangerous levels of electricity that can cause lethal shocks, even if the PSU has been unplugged from the wall for days. If a PSU fan fails or the unit smells burned, replace the entire PSU. Always use the modular power cables that came with that specific PSU model.
Windows Version & Compatibility Notes
Modern high-end graphics cards (ATX 3.0 / PCIe 5.0 standard using 12VHPWR connectors) demand rapid transient response times. Older ATX 2.0 PSUs are prone to triggering protection shutdowns during sudden GPU power surges, requiring modern power supplies designed for transient spikes.
Diagnostic Tools & Log Analysis
To test a PSU safely, use a digital multimeter to measure the voltage outputs of the 24-pin and PCIe connectors. You can use dedicated PSU tester modules, or check telemetry sensors in HWiNFO64 to monitor voltage drops on the 12V rail under load.
When to Seek Professional Hardware Help
If your PC shuts down under load, if the 12V rail drops below 11.4V in HWiNFO64, or if you hear loud coil whine or clicking sounds from the PSU, the unit is degraded. We recommend replacing it immediately with a certified, high-quality PSU from a reputable brand.
Frequently Asked Questions
When the CPU and GPU draw peak power during gaming, they create transient power spikes. If the PSU is degraded, underpowered, or lacks sufficient rails, the Over-Current Protection (OCP) or Over-Power Protection (OPP) triggers, shutting off the PC to prevent hardware damage.
Voltage ripple is the residual AC voltage fluctuation left on the DC power rails. High ripple delivery forces motherboard VRMs and graphics card capacitors to filter noisy power, causing overheating, degradation, and calculation instability in CPU and RAM chips.
No, modular cables do not have standardized pinouts on the power supply side. Plugging cables from a different PSU brand can connect the 12V pin to a ground pin, causing a short circuit that instantly destroys motherboard components, graphics cards, and hard drives.
Detailed Troubleshooting Guide Available
We have written a comprehensive, step-by-step diagnostic guide covering these types of issues in depth.
Read the Power Supply (PSU) Troubleshooting GuideErrorsFixer Technical Team
This troubleshooting guide was reviewed and verified by our hardware diagnostics department to ensure step-by-step resolution accuracy.
Need more help?
If these steps didn't resolve your issue, try searching our database for related symptoms or hardware components.
Back to Search