If your computer isn’t turning on at all—no fans are running, no lights are blinking, and nothing appears on screen—you probably have a power issue. Unplug your computer and plug it directly into a wall outlet you know is working, rather than a power strip or battery backup that may be failing.

How do you fix a computer that won’t turn on?

How to troubleshoot your Windows PC when it won’t turn on
Try a different power source.Try a different power cable.Let the battery charge.Decrypt the beep codes.Check your display.Check your BIOS or UEFI settings.Try Safe Mode.Disconnect everything non-essential.

When I press the power button on my computer nothing happens?

If you’re still getting absolutely nothing when you press the power button, look to see if your motherboard has any idle indicator lights to confirm that the motherboard is definitely receiving power. If not, then you might need a new power supply. Make sure it runs to the motherboard and is well connected.

Use the power button
Locate your computer’s Power button.Press and hold that button until your computer shuts down.Wait until you hear the computer’s fans shut off, and your screen goes completely black.Wait a few seconds before pressing and holding the power button to initiate your computer’s normal startup.

Why did my computer turn off by itself and wont turn back on?

Your computer suddenly turned off and won’t turn back on could be a possible result of a faulty power cord. If there is sufficient electrical connection, the multimeter will beep, or else it would probably mean that power cords are faulty. In that case, it would be best to replace the power cords.

Check if there’s any dent on the power button. Perhaps your phone fell on the ground and the power button got stuck or broken. If the power button is broken then you’ll need to replace it. When the power button is stuck, you can try shaking the phone and it is hopeful the button could bcome unstuck.

What to do when your computer turns on but the screen is black?

Replace the defective hardware once you’ve identified it. Test your computer’s hardware using a Power On Self Test card.

Try reseating the following components and then test if your computer displays something on screen:
Reseat all internal data and power cables.Reseat the memory modules.Reseat any expansion cards.

Why PC suddenly shut down?

Generally, when a computer powers down on its own it’s due to the power supply, malware, overheating or driver issues.

An overheating power supply, due to a malfunctioning fan, can cause a computer to shut down unexpectedly. Continuing to use the faulty power supply can result in damage to the computer and should be replaced immediately. Software utilities, such as SpeedFan, can also be used to help monitor fans in your computer.

How do I know if my power supply or motherboard is bad?

Check the connection for each PSU cable running to the computer hardware component. Look inside the case for the motherboard light. Usually flashing lights on a motherboard indicate a faulty or misconnected power supply.

What can cause a power supply to fail?

To summarize, high quality PSUs can fail for the following reasons:
Broken MLCC components.Long mounting PCB screws.Damaged ICs and FETs because of soldering-wave issues.Careless soldering jobs/repairs.Cracked PCBs.High inrush currents.Creepy-crawlies.High surge voltages.

How do I know if my motherboard is bad?

Symptoms of Failure
Physical Damage. You should never poke or prod a motherboard while the computer is running.Freezes or Glitches. One of the more annoying symptoms is the variety of freezes and glitches.The Blue Screen of Death. Slowing Down. Not Recognizing Hardware. Overheating. Dust. Smacked Around.