“PC Won’t Boot” Troubleshooting Guide

1. Symptoms   No lights, fans spin but no display, beeping, etc.

2. Quick Checks

• Power cable
• Monitor connection
• Try another outlet

3. Internal Checks

• Reseat RAM
• Check motherboard for damage (burnt spots, swollen capacitors) 
• Test PSU with a known‑good unit

4. Diagnostic Tools

• POST card error codes
• Bootable USB diagnostics

5. Fixes

• Replace faulty RAM
• Replace PSU
• Replace motherboard