You press the button and nothing happens. Or the lights come on but the screen stays black. A laptop that won’t turn on is scary — especially if it holds work or photos without a backup — but the cause is often simpler than it looks.
Let’s separate the two most common cases and see what you can check yourself before taking it in for repair.
First: no power, or no picture?
They’re different faults:
- No power: no lights, no fan noise, no sign of life at all.
- Powers on but no picture: lights come on or the fan spins, but the screen stays black.
Look carefully before going on, because the path is different.
If there’s no sign of life
1. Check the charger
- Does the charger’s light come on (if it has one)? And the laptop’s charging light when you plug it in?
- Try another socket and, if you can, another compatible charger (same voltage, equal or higher wattage).
- Check the cable along its length: chargers very often break next to the plug or next to the power brick.
- If your laptop charges over USB‑C, try another USB‑C port on the machine: not all of them accept charging.
2. Do a hard reset (drain residual power)
Sometimes the laptop gets “stuck” in a board error state. To reset it:
- Unplug the charger.
- If the battery is removable, take it out.
- Hold the power button for 30 seconds.
- Plug in only the charger (without the battery, if you removed it) and try to power on.
Many laptops with an internal battery have a small reset pinhole underneath: press it with a paper clip for a few seconds. Check your model’s manual.
3. Let the battery charge
If the battery was completely drained, some laptops need to charge for a few minutes before they respond to the button. Leave it plugged in for 15–30 minutes and try again.
If it powers on but the screen is black
- Turn up the brightness with the function keys. Obvious, but it happens.
- Connect an external monitor via HDMI. If you get a picture there, the problem is the screen, its cable or the backlight — not the rest of the machine.
- Listen for beeps or watch for LED blinks at power-on: many manufacturers use beep or light codes to signal RAM or board faults. Your model’s manual explains them.
- If you’ve just installed RAM, reseat it or try the original module.
When the problem is on the motherboard
If you’ve ruled out the charger, battery and screen, the fault is on the motherboard. The most common causes:
- Damaged charging port (the DC jack or USB‑C port), from the cable being yanked.
- Charging circuit failure: the chip that manages incoming power, often damaged by a faulty charger or a voltage spike.
- A burnt MOSFET or fuse on the power input.
- A short circuit on a power rail, often from liquid spilled on the keyboard.
- BIOS chip or firmware failure.
These faults aren’t visible to the naked eye. At the bench we power the board from a bench power supply, measure which voltages are present and which aren’t, and find the failing component — often a small part that can be replaced with micro-soldering without replacing the whole board.
What about my files?
In the vast majority of cases, your data is intact: the drive (SSD or hard drive) is a separate part and usually isn’t affected by a power fault. Even if the repair isn’t worth it, files can normally be recovered by connecting the drive to another computer.
What you should not do is force the laptop open or keep trying chargers with different voltages: you can make the fault worse.
Summary
- Work out: no power at all, or power but no picture?
- Try another socket and a compatible charger.
- Do a hard reset (30 seconds on the button) or use the reset pinhole.
- Let it charge for 15–30 minutes.
- Try an external monitor if there are lights but no picture.
- If nothing works, the problem is on the board: it needs diagnosis.
Laptop repair in Carcaixent and La Ribera
At Systemaxo we do computer and laptop repair in Carcaixent, Alzira, Algemesí, Xàtiva and nearby towns (Valencia), including motherboard repair. Tell us the make, the model and what it does (or doesn’t do) when you press the button, and we’ll tell you what it might be.