Computer won’t start when atx12v is connected (Do This)

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Are you facing a problem Computer won’t start when atx12v is connected so here is guideline for you. A certain sense of satisfaction can be found in making your PC. It may be a lot of fun to research the construction, possibly save money for the various parts, and then put it all together.

Some builds are simpler than others; for example, installing the stock air cooler and connecting the case fans is far easier than creating a custom water cooling loop.

It makes no difference, though, because hitting the power button for the first time and witnessing the perfectly built system suddenly come to life is an exhilarating experience. Alternatively, if nothing happens, it might be excruciatingly unpleasant.

Computer won't start when atx12v is connected

Even the simplest constructions occasionally exhibit stubbornness. Your knowledge, tolerance, and troubleshooting skills will be put to the test by a freshly assembled PC that won’t boot. Sometimes a faulty component is all that stands in your way of experiencing the joy of a first boot.

But more frequently, the build-process problem is to blame. Don’t worry; even if you’ve been building PCs for a long time, these things still happen.

Computer won’t start when atx12v is connected:

Ensure that the CPU Cooler is connected to the motherboard’s CPU Fan. Suppose you set up your CPU fan to get power from the mobo’s NB connection fan whenever your computer is turned on. Because you connected the CPU fan to the NB fan, the mobo checks the CPU FAN’s RPM but can’t find it, which causes the system to hang. Also, switch all outside fans so that they get power directly from the power supply (do not connect to mobo)

How to Fix a Computer That Shows No Sign of Power?

Unbelievably, failing to turn on the computer is the main cause of it not turning on! Verify that every power switch and button connected to your computer system is turned on before beginning a time-consuming troubleshooting procedure:

  • The power switch is typically found on the top or side of a laptop or tablet or on the front of a desktop computer’s chassis.
  • Back of the computer power switch, which is often only found on a desktop
  • If you use a power strip, surge protector, or UPS, turns the power switch on.

Inspect computer power cable connections for broken connections. A loose or unplugged power cable is one of the most common causes of a computer not turning on.

Although your computer is battery-powered, you should ensure the AC adapter is plugged in properly, at least while troubleshooting. Your computer might not be receiving power if you typically leave it plugged in, but it has wiggled loose, and the battery is now empty.

If it hasn’t already, plug your desktop, laptop, or tablet directly into the wall. To put it another way, take out any power strips, battery packs, or other power-distribution tools in the way of your PC’s connection to the wall outlet.

If your computer starts receiving power after doing this, the issue was caused by something you eliminated from the equation. Your surge protector or other power distribution equipment will probably need to be replaced. Continue troubleshooting with the PC plugged into the wall to keep things straightforward if nothing changes.

How to Fix a Computer That Shows No Sign of Power

The 7 Best Surge Protectors of 2022:

Run a “light test” to ensure the electricity comes from the wall. You must ensure that the power supply is functioning properly since your computer won’t turn on if it doesn’t have power. We do not advise using a millimetre to test an outlet.

A tripped breaker may occasionally leak just enough power to cause the right voltage to appear on the meter, leading you to believe that your electricity is operational. Using an actual “load” on the outlet is preferable, such as a lamp.

Best Surge Protectors of 2022

Using a desktop, ensure the power supply voltage switch is properly set. Your computer might not turn on at all if the input voltage for the power supply unit (PSU) is incorrect for your country. Take off the laptop or tablet’s primary battery and try using AC power solely. You are; in fact, free to use your portable computer without a battery.

If you attempt this and your computer starts up, your battery is the root of the issue, so you should replace it. You may use your computer as long as you are near a power outlet until you have it replaced. Carefully check the laptop or tablet’s power socket for damage. Examine the area for debris or broken/bent pins that could block the computer from receiving power and charging the battery.

Other than straightening a bent pin or cleaning out some dirt, you’ll likely need to contact a reputable computer repair shop to address any significant issues you notice. If you work on this yourself, take the internal battery out of the laptop to reduce the chance of shock.

Change the computer’s AC adapter or power cable. This is the power connection that runs between the computer case and the power supply on a desktop. The wire you insert into the wall to recharge the battery on a tablet or laptop is known as the AC adapter (it usually has a tiny light on it).

Tablets and laptops that refuse to switch on at all frequently have issues with their AC adapters. If the power cable has failed, it hasn’t been charging your battery, even if you don’t frequently use it. Although it is uncommon, a bad power cable can nevertheless prevent a computer from receiving power and is relatively simple to test for. Use the one that’s powering your monitor if it appears to be receiving power, a new one, or one from another computer.

If your computer is more than a few years old, has frequently been left off or has had the primary battery removed, replace the CMOS battery. Unbelievably frequently, a computer that appears to be without power can be traced back to a defective CMOS battery. You can purchase a new CMOS battery for less than $10 almost anywhere that sells batteries.

If using a desktop, make sure the power switch is plugged into the motherboard. Even though this is not a common cause of failure, your computer may not be turning on because the power button is not correctly attached to the motherboard.

Most case switches are wired to the motherboard in a red and black twisted pair. Your computer probably won’t switch on if these wires aren’t connected properly or aren’t connected at all. Similar connections between the button and the motherboard are frequently present in laptops and tablets, but they are extremely difficult to access.

If you’re using a desktop PC, check the power supply. Your computer’s power supply unit is likely broken at this stage of troubleshooting, at least for desktop users, and you should replace it. To be certain, you should test it, though. When checking a functioning piece of hardware is relatively simple, there is no need to replace it.

When there is no power reaching the computer, and there is an ozone smell or a high-pitched noise, the power supply is almost certainly faulty. Go ahead and unplug your PC and skip the exam. If your power supply fails your testing, or you see the signs I just mentioned, replace it. After replacement, wait five minutes before turning on the computer, so the CMOS battery has a chance to recharge.

Most of the time, a broken power supply is at blame when a desktop computer isn’t getting power. I bring this up once more to emphasize how important it is that you not skip this troubleshooting step. The next few reasons to think about aren’t quite as frequent.

Check your computer’s power button on the front of the casing; if it doesn’t work, replace it. Only desktop machines are affected by this procedure. Depending on how your computer’s case is made, you might be able to turn it on temporarily by pressing the reset button.

The power button on the case can be tested more easily because some motherboards have tiny power buttons built right into the boards themselves. The case power button likely needs to be changed if your motherboard has this and can turn on your computer.

If you have a desktop computer, replace the motherboard. If your electrical outlet, power supply, and power button are all functioning properly, your PC’s motherboard most certainly has a problem, and you should replace it. Your computer ought to should now be functional once more.


Are you resolving this problem Computer won’t start when atx12v is connected on a computer that you recently constructed? If so, double and triple verify your setup! Your computer might not be turning on because of a settings issue rather than a hardware issue. Did we overlook a troubleshooting step that resolved your issue with the computer or might help someone else? Please tell me if you want the details to be added here.

Frequently Asked Questions

Is the ATX12V necessary?

The motherboard receives an additional 12V current through this port. Higher current demands, like as extreme overclocking or significant video card current draw, may necessitate it even if the system will probably function without it.

What is the ATX12V plug on the motherboard?

If you are not utilizing the EPS12V connector described below, you must attach this 4-pin connector to the motherboard. It supplies electrical current to your CPU. The majority of processors, whether they are Intel or AMD, use the ATX12V 4-pin connector.

What does ATX12V EPS12V mean?

The 8-pin connector for CPU power is known as EPS12V. The form factor, ATX12V (ATX form factor, supplies 12V, internally converted to 5v and 3.3v).

Is ATX12V better than ATX?

The power efficiency rating, which defines how much power is drawn from the wall in comparison to the output of the computer, is another distinction between ATX and ATX12V. Some older ATX PSUs have an efficiency rating below 70 percent, although the ATX12V standard demands a minimum rating of 80 percent.

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