First check whether the computer has no power, has power but no picture, or shows a logo but cannot start Windows. These symptoms require different fixes; reinstalling Windows cannot repair an unpowered computer.
Stop if you notice liquid damage, smoke, a burning smell, a swollen battery or a damaged charger. Disconnect power if safe. Never open a power supply or a battery pack.
Observe before changing anything
Press the power button once and watch closely. Record lights, fan movement, beeps, keyboard illumination and anything shown on screen. A photograph of a message or blinking pattern can help identify a model-specific fault.
A light on a charger proves only part of the power path is working. A fan turning does not prove Windows started. Keeping these observations separate prevents unnecessary software repairs.
If there are no lights or fans
Start with the external power path. Use the charger intended for the computer; a USB-C connector alone does not establish the correct power capability.
- Test the wall outlet with another safe appliance. Temporarily bypass a suspect power strip.
- Inspect the accessible power cable and connectors for damage. Reconnect both ends firmly without forcing them.
- On a desktop, check the external power switch at the rear if present. Do not change a voltage selector.
- On a laptop, connect the correct charger and allow time for a deeply discharged battery before retrying. Follow the model manual for the expected charging indicator.
- Remove nonessential USB accessories, docks and external drives, then try again.
If lights are on but the screen is blank
Check the screen’s brightness, monitor power and selected input. A desktop monitor needs its own power source. Confirm that the video cable is connected to the appropriate output for your configuration.
Disconnect a dock and test the laptop’s built-in display. If practical, try a known-working monitor and compatible cable. Change one piece at a time so a result tells you something.
If Windows seems to be running, its display may be the issue. Try Windows + Ctrl + Shift + B once to reset the graphics driver. A brief beep or flicker can occur. This shortcut will not help a computer that never reached Windows.
If a logo or error appears
Reaching the manufacturer logo indicates a different situation from no power. Note whether it freezes there, reports a missing drive, requests a recovery key, or begins loading Windows.
Disconnect unnecessary external storage and retry a normal start. Do not alter boot mode, clear security keys or format a drive in response to an unfamiliar startup message. Those changes can make files harder to recover.
For beeps or blinking diagnostic lights, use the support manual for the exact model. The same pattern can mean different things on different products. Manufacturer preboot diagnostics may help, but follow that model’s instructions rather than a generic key combination.
When a reset or professional help is appropriate
Some manufacturers document a power-drain or hard-reset procedure. Use the procedure for your exact model; internal batteries and power controls vary. Do not open the case to disconnect a battery based on instructions for another machine.
If power checks fail, or diagnostics report a hardware fault, request service. Explain whether your priority is restoring operation or recovering irreplaceable files. Ask the provider to obtain approval before erasing or replacing storage.
Have the model, warranty details and observed light pattern ready. If the computer belongs to your employer or school, contact its support team before opening it or changing firmware settings.
Once the computer is working again, make a verified backup before further troubleshooting.
Sources and further help
Official documentation used to check the guidance. Menu names and options can vary by device and software version.