Laptop won't turn on - no-power troubleshooter
Laptop dead, no lights or a black screen? Answer a few questions about the charger and the lights. It shows the likely fault, what you can try yourself and when it needs a technician.
How it works
Answer one question at a time. One tap moves on.
It ends with the likely fault and when it needs a technician.
No-power troubleshooter
Safety first. Stop and bring it in if you smell burning, the battery is swollen (case or touchpad lifting), liquid went inside or the charger cuts out when you plug it in. Unplug it and don't keep trying because every try can damage more parts.
The order we check a laptop that won't turn on
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- Charger: its own light, another socket, a known-good charger with the same plug and watts. USB-C: another laptop charger in every port.
- Power reset: charger out, power button held 30 seconds (Dell 30-35 s, HP about 15 s), or the emergency-reset hole on ThinkPads. It clears a locked-up embedded controller.
- Lights: the laptop's charging light shows the board gets power. A charger light that goes out when it touches the laptop means a short circuit - unplug it.
- Blinks and beeps: a repeating pattern is a code; look it up in the laptop error code finder.
- External monitor: a picture there means the laptop runs and only its screen, cable or backlight is at fault.
- Current draw: a USB-C meter or bench supply shows whether the board takes nothing, a small standby current, a start attempt, or a short.
- Board level: a technician measures the power rails in the order the laptop switches them on, and reads the BIOS chip.
What the current on a USB-C meter tells you
| Meter shows | What it usually means |
|---|---|
| 5 V, 0.00 A | The laptop takes nothing and cannot ask for more than 5 V: the port, the input fuse, the USB-C controller, or a missing always-on rail. |
| A small, steady current; nothing changes on the power button | Standby power is up; the start signal doesn't work: power button, embedded controller, BIOS chip. |
| Current rises on the power button, then falls back | A start attempt that stops at a power stage, the RAM or the BIOS. |
| High current at once, or 5 V / 20 V over and over | A short circuit on the main power rail - unplug it. |
| Rises to several watts and stays, fans run | The laptop is running; look at the screen, the RAM and the codes instead. |
Every USB-C charger starts at 5 V and goes to 20 V only when the laptop asks for it. So 5 V on the meter is normal. 5 V with 0 A is the fault.
Still dead after these checks? Post the laptop model and your answers (use "Copy my answers") on the NoPowerFix forum and a technician will answer.
Ask on the NoPowerFix forumFree, private, built to keep devices alive
In 15 years at the bench we saw too many good devices go in the bin because nobody found the real fault. Our Hardware Specialist and Senior Repair Technicians built these tools so more devices get fixed instead of thrown away. If they helped you, a review helps the next person find them, and your support pays for the next fix.
> goal: Less e-waste · Greener Earth
We find the real fault before parts are replaced, so fewer working batteries, boards and devices end up as e-waste.