Why your PC is Not Booting After Installing a PSU

Can A PSU Cause A PC To Not Boot?

Yes, a PSU can cause a PC not to boot, either because the PSU is faulty or the PSU isn’t connected to the PC components correctly.

 

Causes

• Faulty PSU
• Wrong PSU
• Using old cables
• Incorrect connections

 

Why Is My Computer Not Booting After Installing A PSU?

The main reason your computer is not booting after installing a PSU is because the PSU connections are incorrect, PSU is supplying inadequate power, or the PSU is faulty.

 

• Faulty PSU
• Incorrect connections
• Using old PSU cables
• Wrong PSU

 

Faulty PSU

Faulty PSUs are a common occurrence if you buy cheap PSUs. A faulty PSU can also cause damage to other components of the PC like the motherboard, RAM, and graphics card.

There is no way to protect yourself from getting a faulty PSU, but opting for cheaper PSUs will increase the chances of you ending up with a faulty PSU.

 

Incorrect Connections

When installing your PSU, getting all the connections right is important. The 24-Pin cable will always connect to the motherboard.

There will be an 8-pin cable for the CPU. You will also have to connect the power cables to the graphic cards.

If any of these connections are loose or incorrectly placed, your PC will give you trouble.

 

Using Old PSU Cables

This isn’t a common problem, but some users have mistakenly used the cables from their old PSU while installing the new one.

All PSUs have different cabling, and using the old cables can be very dangerous. Some have reported a short circuit and fire erupting in their PCs due to the old cabling.

 

Wrong PSU

Choosing the right PSU is important. If you choose a PSU that doesn’t supply enough power to your system, your PC will not boot.

 

 

Why Is My Computer Turning OFF After Installing PSU?

The reason your computer is turning OFF after installing PSU is because the PSU is faulty or it isn’t supplying enough power to the PC’s components.

 

Solution

• Change the PSU
• Check all connections

 

If your computer keeps turning off after installing a new PSU, then one of two things is causing this problem. And the solution for both is to change the PSU.

Below you will find the steps to resolve this issue:

1. The first thing to check is whether the PSU is faulty or not. To do this, you need to test the PSU.
2. You will need a multimeter to test the PSU.
3. The multimeter has two probes; one black and one red. Connect the black probe to any ground wire pin and the red one to the 24 pin motherboard connector pins.
4. Test each pin to check the voltage being supplied. If no voltage is detected or too low or too high, you know it’s a faulty PSU.
5. To determine whether your PSU is the right one, you need to multiply the total amps and volts of all the PC’s components. This will give you the total watts.
6. Your PSU should be able to supply the calculated total watts.
7. If your PSU isn’t faulty and the power supply is adequate for your PC, run a check of all the connections. A loose connection could also be the cause of this issue.

 

How To Fix A PC That Keeps Turning Off After Installing PSU

To fix a PC that keeps turning OFF after installing PSU, you have to check the connections of the PSU with other PC components or replace the PSU.

 

Solution

• Check the connections of the PSU with the other components of the PC
• Change the PSU

 

The power supply unit is responsible for supplying power to all the PC components. So a faulty PSU can be a big issue.

Follow the steps below to resolve the problem of your PC turning off after installing PSU:

• The first step is to confirm if the PSU is faulty or not.
• You will need a multimeter to test the PSU.
• The multimeter has two probes; one black and one red. Connect the black probe to any ground wire pin and the red one to the 24 pin motherboard connector pins.
• Test each pin to check the voltage being supplied. If there is no voltage detected or too low or too high, you know it’s a faulty PSU.
• To determine whether your PSU is the right one, you need to multiply the total amps and volts of all the PC’s components. This will give you the total watts.
• Your PSU should be able to supply the calculated total watts.
• Lastly, if the PSU isn’t faulty, then check the connections. There could be a loose connection, or maybe the wrong cable is attached to the wrong component, which could be causing the issue.

 

Why Won’t My Computer Boot After Installing A New PSU

The reason your computer won’t boot after installing a new PSU because you have a faulty PSU, an incompatible PSU, or your PSU isn’t connected properly to your computer.

 

Causes

• Faulty PSU
• Incorrect connections
• Using old PSU cables
• Wrong PSU

 

If your PC won’t start after installing your new PSU, there is no need to fret, especially if you have bought a PSU from a reputable brand. Some of these issues are quite easy to resolve.

 

How To Fix A Computer That Won’t Turn On After Installing PSU

To fix your computer that isn’t turning on after installing PSU, you need to check all the connections in the PC, replace old cables, or replace the PSU completely.

 

Solution

• Check all the connections
• Replace old cables with new ones
• Check if PSU is supplying enough power to the PC
• Test PSU and replace if faulty

 

If the PC doesn’t turn on after you’ve installed the PSU, you may be worried, but if you’ve bought a PSU from a recognized brand, there is nothing to worry about.

 

I have highlighted the steps below to resolve this issue:

1. The first thing you need to do is change the cables if you’ve used cables from your old PSU. This is very dangerous, and some users have reported that a fire has erupted in their PCs due to using old PSU cables.
2. If you’ve already been using the new cables, check all the cable connections you’ve made. The connection to the motherboard and CPU is very important, so ensure the pins are inserted tightly.
3. If the connections are all fine, then test the PSU.
4. You will need a multimeter to test the PSU.
5. The multimeter has two probes; one black and one red. Connect the black probe to any ground wire pin and the red one to the 24 pin motherboard connector pins.
6. Test each pin to check the voltage being supplied. If no voltage is detected or too low or too high, you know it’s a faulty PSU.
7. If your PSU is faulty, you will have to get it replaced.
8. If the PSU is fine, calculate the total watts needed by your PC by multiplying each component’s total amps and total volts. This will give you the total watts, and if your PSU is unable to supply this, you’ve got the wrong PSU.

 

Why Does My PC Keep Freezing After Installing A New PSU

To fix your PC that freezes after installing a new PSU, you need to upgrade the PSU to supply enough voltage for the PC to run smoothly.

 

Causes

• Inadequate power supply

 

Buying a PSU without knowing the power required by your PC is a big mistake. If you buy a PSU that provides inadequate power to the PC’s components, then your PC will freeze from time to time.

 

You can find steps to manage this issue below:

1. Firstly you need to calculate how much power your PC requires. It would be best to calculate how much power each component needs to do this.
2. The method to do this is by multiplying the total volts and the total amps of the components. This will give you the total watts needed by the PC.
3. I recommend getting a PSU that is higher than the required watts.

 

Why Is My PC Crashing After Installing A PSU

To prevent your PC from crashing after installing a PSU, you must check all the connections between the PSU and the PC’s components.

 

Solution

• Check the cable connections
• Ensure adequate power is supplied to the PC

 

If your PC is crashing after installing a PSU, there could be a loose connection in the cables. It could also be because of a faulty PSU.

Let’s take a look at the steps you can take to resolve this issue:

1. The first thing to do is remove the casing of the PC and check each connection from the PSU to the components of the PC
2. If each connection is tight, then calculate the total number of watts needed by your PC
3. Multiply the total volts with the total amps for all the PC components. This will give you the total watts.
4. You will have to change the PSU if the power supplied to the PC doesn’t match the total watts needed by the PC
5. Lastly, if your connections are fine and the supply is adequate, you may have a faulty PSU and need to replace it.

 

Do I Need To Do Anything After Installing New PSU

After you have installed a new PSU, you need to turn on the PC, run it for a while and see if it crashes or freezes.

 

Causes

• Loose connection
• Faulty PSU
•  

Nothing special needs to be done once you’ve installed your PSU. You need to start the PC and see if it turns on. After that, run it like you normally would and check for any unusual activity like the PC crashing or freezing.

This is usually a sign of a loose connection or a faulty PSU.

 

What To Do After Installing New PSU Windows 11?

After you have installed your new PSU on your Windows 11 PC, you need to run the PC for a while and see if it crashes or freezes.

 

Causes

• Loose connection
• Faulty PSU

Once you’ve installed the PSU on your Windows 11 PC, you need to observe whether the PC crashes or freezes. This will indicate if you’ve left a cable loose or if the PSU is faulty.

There is no need to reinstall windows as changing the PSU does not affect it.

 

Conclusion                       

I hope this has helped you understand your PSU-related problems and how to solve them. One advice that I can give readers is always to buy your PC components from a reputable brand and avoid cheap parts.