Troubleshooting

PC troubleshooting starts with one question: what changed? A system that ran fine yesterday and crashes today changed something — a driver, a temperature, a Windows update, a setting in BIOS, or a part that’s slowly failing. This category covers the diagnosis side of PC ownership: post-failure debug codes, motherboard status LEDs, GPU temperatures that hint at fan failure versus airflow issues, CPU thermal behavior, and the white-light-on-motherboard symptom that means something specific on every brand. Each guide assumes you don’t want a generic checklist — you want to know what your symptom actually means, what the most likely cause is, and how to confirm it before you start swapping parts. Where temperatures are involved, articles include the safe ranges, the throttling thresholds, and the danger zones for the specific GPU and CPU generations covered. The goal is not “try this and see” — the goal is to narrow down the cause before touching the hardware. For boot-stage failures, check our BIOS Settings guides; for thermal problems, see Cooling & Airflow; for component identification, see Hardware Guides.