Short Answer: This is called a "no POST" (Power-On Self-Test) situation — the computer fails before it can show anything on screen.
Detailed: No display means the computer isn't completing its initial hardware check. Possible causes:
| Symptom | Likely cause | Quick test |
|---|---|---|
| Fans spin, lights on, no beeps | RAM issue (loose or dead) | Reseat RAM sticks |
| Fans spin, then stop, then spin again | Power supply failing | Test with different PSU (desktop) |
| Power light on, nothing else | Dead motherboard | Look for swollen capacitors |
| Caps Lock key responds (lights toggle) | Display issue (backlight or cable) | Shine flashlight at screen — see faint image? |
| Beeping sounds | POST error code | Count beeps — search online |
Quick troubleshooting sequence (desktop):
Check monitor cable — is it plugged in firmly?
Try a different monitor or TV — rule out monitor failure
Remove all USB devices — sometimes a shorted device prevents boot
Reseat RAM — remove, clean contacts with eraser, reinstall
Remove graphics card (if you have integrated graphics) — plug monitor into motherboard
Reset CMOS — remove motherboard battery for 30 seconds
Listen for beep codes — one short beep = good; other patterns = problem
For laptops: Try holding the power button for 60 seconds (drain residual charge), then plug in and try again.
Pro tip: If Caps Lock key toggles the light on your keyboard, the computer is actually running — the display or display cable is the problem.
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