PC Starts Then Shuts Off After 1 Second? Fix It Fast (Step-by-Step Guide 2026)

PC Starts Then Shuts Off After 1 Second? Fix It Fast (Step-by-Step Guide 2026) First Paragraph Hook: You press the power button, your PC lights up for just a second—and then suddenly dies. No warning, no error message. It’s frustrating, confusing, and can feel like your computer is completely broken. But here’s the truth: this is a very common problem, and in most cases, it can be fixed without replacing your entire PC. In this complete guide, you’ll learn why your PC starts then shuts off instantly , the real causes behind it, and step-by-step solutions to fix it quickly—even if you’re a beginner. 🔍 What Does This Problem Mean? Definition: A PC that turns on and shuts off immediately is experiencing a power interruption or hardware failure during the startup process . Explanation: When you power on your computer, multiple components—like the motherboard, CPU, RAM, and power supply—must work together instantly. If any part fails or detects an issue, the system shuts down automatically…