If your desktop computer does not turn on after pressing the power button, use the information and troubleshooting steps below to help you solve the problem.
Reason For Computer Not Turn on
Check out the reasons why my computer does not turn on
1. I’m not sure if my computer is on.
If you’re not sure if the computer is turning on, check to see if the case fan (usually located on the back of the computer) is spinning. If a fan is spinning, the computer is receiving power, and this page may not be applicable to your problem.
2. The power cord is not properly connected.
Check that the power cord is connected to the back of the computer and plugged into a power outlet. If the power cord appears to be properly connected, disconnect and reconnect both ends to ensure the cable is not loose.
3. Outlet or power strip
Disconnect the computer power cord from the power strip (surge protector) or UPS (uninterruptible power supply) and connect it directly to the wall outlet if you have one.
If connecting the computer directly to the wall outlet still does not work, try connecting another electrical device to the outlet.
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4. faulty power cable
Replace the cable that supplies power to your computer to ensure it is not faulty or damaged.
If you don’t have another power cable to test with, see if you can borrow one from a friend or family member. A new power cable can also be purchased online.
5. Switch for power supply
Some power supplies, as shown in the image, have a power switch on the back. Examine the back of the computer to ensure that no additional buttons have been accidentally turned off.
6. Inadequate power supply
If you built the computer and it won’t turn on, the power supply may be defective or insufficient for the needs of your hardware. Check that your power supply meets the specifications of your motherboard, processor, and video card.
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7. Hardware from third parties
If you have recently added computer hardware, we recommend that you temporarily disconnect or remove it to ensure that it is not causing your problem.
8. Power supply, button, power board, or inverter failure
If your computer still does not power on after completing the steps in the preceding sections, the power supply may have failed. If you don’t want to replace it yourself, we recommend bringing the computer to a repair shop.
If you intend to repair a desktop computer yourself, open it up and double-check the power connections. To ensure that the main power cable has not become loose, disconnect and reconnect it. Check that the power button cable is properly connected to the motherboard.
If the power button becomes stuck when pressed or does not push down very far, it is defective or has bad contact. Repairing a faulty power button is difficult and may necessitate the assistance of a computer repair shop or the replacement of the computer case.
You can also use a multimeter to see if the power supply is producing the correct voltage. If the voltage output is low, the power supply is most likely defective and must be replaced.
9. Hardware that is loosely connected
When your computer attempts to boot up, it performs a POST. If any of the computer’s hardware components fail this test, the computer will not boot.
Unplug all cables from the computer’s back. Reinstall all expansion cards and memory by opening the computer. After reseating these cards, disconnect and reconnect all cables to ensure they are securely connected.
After reconnecting everything, connect only the power cable to the back of the computer and try turning it on. If the computer powers on, turn it off and reconnect all the cables.
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10. faulty motherboard
If the power supply connections appear to be fine but the computer still does not power on, the motherboard may be faulty. First, open the computer case and inspect the motherboard visually. Look for any capacitors that have bulged or blown.
If you recently soldered on your motherboard, some of the soldiers may have connected two or more contact points that should not have been connected. Incorrect connections can cause the computer to not power on or boot.