Title: Troubleshooting a Non-Responsive PC: When It Turns On but No Video or Peripheral Response
Experiencing a computer that powers on but displays no video output and doesn’t recognize keyboard or mouse inputs can be incredibly frustrating. Understanding how to systematically diagnose and resolve such issues is essential for both beginners and experienced users. In this article, we’ll explore common causes, troubleshooting steps, and potential solutions based on a real-world scenario.
Scenario Overview
A user reports their PC powers on — fans (including GPU fans) start spinning — but no video output appears, and peripherals like the keyboard and mouse remain unresponsive. The user has the following specifications:
- CPU: Intel Core i5-12400F
- GPU: AMD RX 6700 XT
- Memory: 2×8GB DDR4 RAM sticks
- Motherboard: Gigabyte H610M
- Storage: Two 1TB HDDs, one 1TB SSD, one 500GB SSD
- Power Supply: Corsair CX650W (new, two months old)
The user also attempted multiple troubleshooting steps, including reseating components, resetting BIOS, testing with minimal hardware, and replacing parts but encountered persistent issues.
Common Causes of No Video and No Peripheral Response
Before diving into troubleshooting, it’s essential to recognize potential causes:
- Faulty or incompatible RAM or CPU
- Graphics card issues (hardware failure, insufficient power, or connection problems)
- Motherboard faults, including BIOS corruption
- Power supply deficiencies or failures
- Loose or improperly seated components
- BIOS/UEFI misconfigurations
- Peripheral or input device issues
Step-by-Step Troubleshooting Guide
1. Verify Basic Power and Connections
- Ensure the power supply switch is ON, and the power cable is properly connected.
- Confirm the motherboard’s power connectors (24-pin and CPU 8-pin) are securely attached.
- Check that the monitor is connected to the correct video output (GPU or integrated, if available).
2. Test the Hardware Components Individually
- Clear the CMOS: You’ve already reset the BIOS via CMOS pins and removal of the battery. Ensure the motherboard’s CMOS jumper remains in the correct position afterward.
- Minimal Boot Setup: Disconnect all non-essential hardware. Boot with only the CPU, one RAM stick, GPU (if
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