High CPU usage caused by 'System Interrupts'
System Interrupts consumes 20% to 100% of CPU capacity, signaling that a failing hardware device or corrupt driver is flooding the CPU with hardware interrupts.
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
- System Interrupts process sits at top of Task Manager CPU column
- Audio crackles and mouse skips across screen
- PC runs sluggish even with zero user applications open
Interactive Fix Checklist
0 of 4 steps completedUnplug external USB devices one by one
Faulty USB mice, keyboards, webcams, or external soundcards frequently produce interrupt storms. Disconnect peripherals until CPU usage drops.
Run LatencyMon to identify the offending driver
Run LatencyMon, click Start Monitor, and check the 'Drivers' tab. Look for the driver file with the highest DPC/ISR count (e.g., ndis.sys, acpi.sys, nvlddmkm.sys).
Update or reinstall network and audio drivers
Network cards and on-board Realtek audio are common triggers. Reinstall the latest manufacturer drivers.
Check SATA cable and drive SMART health
A failing drive or defective SATA data cable generates continuous CRC communication errors, resulting in high interrupt overhead.
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