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Why your PC Is Not Booting After Installing a New CPU Cooler

Why is my PC not booting after installing a CPU Cooler?

The main reason why your PC is not booting after installing a CPU cooler is becausethe motherboard is unable to detect the new cooler. Also the panel connectors may be misplaced or the CPU is overheating.


Possible Reasons:

  • Incorrectly seated RAM
  • Missing motherboard standoffs
  • Misplaced front panel connectors
  • Overheating CPU
  • Missing power supply cables


Incorrectly seated RAM

RAM sticks are sleek and should be perfectly seated in their slots to let your PC work well. You will have to ensure that the sticks are in their correct slots.


Missing motherboard standoffs

Your PC comes with standoffs that are fixed to lift the motherboard to prevent its contact with the metal tray. In some cases, people cannot fix the standoffs tightly because the PC fails to boot properly.


Misplaced front panel connectors

Your PC comes with many loose wires that need to be connected before it can boot. Any wires that are not fitted correctly will lead to a PC that won’t boot.


Overheating CPU

Whenever the PC runs intensive apps, it gets heated quickly. If the PC fan is not working well, the system shuts down as it fails to cool down.


Missing power supply cables

After a long day of unplugging and plugging the cables on your PC, you may end up leaving a wire disconnected. Your PC will need all of its wires plugged in appropriately for it to function properly.


PC not booting after installing new CPU cooler


Why Is My Computer Turning OffAfter Installing CPU Cooler?

The reason your computer is turning off after installing CPU Cooler is because the RAM heatsink is touching the CPU heatsink, which is disabling itfrom connecting and turning on.


A PC comes with built-in fans that shut down the system in case it observes that temperatures have risen to high levels. It is done to ensure that your CPU is not fried up.


Other reasons that may cause the problem are:

  1. The improper position of the CPU heatsink; if the latter is not seated properly, the PC will keep turning off. However, an indicator of the faulty position is that the PC will run for some time before completely shutting down.
  2. The CPU heartsink may be causing a short-circuit against the motherboard trace. You will have to thoroughly check the motherboard’s sides to rule this out. Most pieces come with transparent paint that doesn’t provide sufficient insulation. Use fiber or plastic washers to rule out the possibility of any shorting.
  3. The frequent shutdowns also indicate that your RAM sticks are causing some problems. This issue can be resolved if the sticks are re-seated. You can try different positions like A1/B1 or A2/B2 to see if the PC is working fine.
  4. Issues with the power supply could also cause frequent turning off of your PC. Checking the power supply and troubleshooting the problem will help ensure that your PC is working well.
  5. The motherboard of your PC may be incompatible with the CPU cooler, resulting in frequent shutdowns. Beginners mostly don’t have much knowledge about the compatibility of motherboards, and hence they end up making mistakes.


How To Fix A PC That Keeps Turning Off After Installing A CPU Cooler?

To fix a PC that keeps turning off after installing a CPU cooler, disconnect all cables from your PC, recheck its wire connection, otherwise try to reseat or reset its RAM.


DisconnectCables [Method 1]

  1. Disconnect all cables from your PC
  2. Remove the panel cover
  3. Remove the CMOS battery motherboard
  4. Press the power button for 5 seconds
  5. Insert the battery into its slot
  6. Turn on the PC


Check Wire Connections [Method 2]

  1. Remove all cable wires
  2. Check if there is any damage to them
  3. Check power connection
  4. Secure the wires


Remove Power Cable [Method 3]

  1. Remove the power cable
  2. Take out the screws and put some paper on them
  3. Insert the screws back in their place
  4. Re-plug all cables
  5. Turn on your computer


Clean RAM Sticks [Method 4]

  1. Take out RAM sticks from their slots
  2. Take the eraser and clean it


Reseat RAM Sticks[Method 5]

  1. Take out RAM sticks
  2. Place them back in the slots and press until you hear the click sound


Why Won’t My Computer Boot After Installing A New CPU Cooler?

The reason your computer won’t boot after installing a new CPU cooler is possibly because of BIOS or motherboard incompatibility.


However, if you have already ruled out that the PC’s hardware is not the culprit, here’s what you can do to resolve this issue:

  • Ensure that all power connections and pin connectors are properly connected and fixed
  • Ensure that the cooler is properly seated in its slot and that it’s plugged in
  • Reset BIOS to Factory
  • Customize fan speed


How to Fix a Computer That Won’t Turn On after Installing CPU Cooler

To fix a computer that won’t turn on after installing CPU Cooler, use a CPU cleaning agent to remove the thermal paste, reapply the grease or check all cable connections again.


There is one thing to note: the CPU cooler itself doesn’t cause any hindrances in the PC’s starting process. Your PC normally flashes a message that it has failed to detect the cooler, and that’s it. If this happens, it means that the cooler is not seated properly in its slot.

If the PC isn’t turning on, the chances are that your CPU moved when you were installing the computer. Re-seat it and see if the PC turns on. Also, ensure that all cables are connected and that there are no loose fittings.


Why Does My PC Keep Freezing After Installing A New CPU Cooler?

The reason your PC keeps freezing after installing a new CPU Cooleris because your computer isn’t upgraded.Another reason could be that the cooler model you installed is not effective in reducing the heat, which is why your PC keeps freezing.


To fix the issue:

  • Set the CPU fan to 100% to see that the system is being cooled down effectively
  • You can also put thermal paste on the fans to avoid the freezing of the PC
  • Ensure that your PC’s fans are not clogged and are regularly cleaned


Why Does My PC Keep Crashing After Installing A CPU Cooler?

The reason your PC keeps crashing after installing a CPU Cooler is because your computer is still overheated.


To fix the issue:

  • Check if the fans need any cleaning
  • Install extra fans to see if the overall temperature drops


It is possible that the thermal paste that you applied to the cooler wasn’t enough, not allowing the device to work properly. To fix this:


  • You will have to open the cooler, clean the compound, and then reapply the paste
  • Since you opened up your PC to install the cooler, check if you have all your pins in their place


Why Is My CPU CoolerDetected But Not Booting?

The reason your CPU Cooler is detected but your PC is not booting is because the new cooler you just installed requires a higher level of power than that provided by your PC.


To fix the issue:

  1. Take out the new cooler and reinstall the old one.
  2. If the computer works well, it means that the cooler requires more voltage.
  3. Either get a low-power cooler or upgrade your PSU.
  4. You can also disconnect the power to the cooler (for a short time) to check if it runs better (this step will save you from the tedious process of cooler swaps.


Tip: You will have to carry out this process with proper care. If your PC has the problem of overheating, the uninstallation of the cooler can lead your PC to fry (it is why it is recommended that you don’t run your PC without a cooler for too long). However, if your PC has a power supply problem, this step can help you.


Should I Update BIOS For The New CPU Cooler?

Yes, you should update BIOS for the new CPU Cooler. Even though BIOS updates don’t cause a problem and your PC will work fine, it is “recommended” to update your BIOS to ensure that there are no issues.


What Do I Need To Do After Installing A New CPU COOLER In Windows 11?

After installing a new CPU Cooler in Windows 11, you must apply the thermal paste to ensure that the CPU is fixed.


Why is my PC not booting after installing the AIO CPU cooler?

The reason your PC is not booting after installing the AIO CPU Cooler is because you haven’t updated the BIOS.


To fix the issue:

  • Update the BIOS
  • Check the 8-pin connection on the CPU
  • Re-seat RAM sticks
  • Re-seat the boot SSD



Many beginners face a few problems after they have installed a CPU cooler. But the process itself is not cumbersome. You should update the BIOS after installing the cooler to ensure the smooth operations of the newly installed component. Be confident when fixing your computer!

Ernie Lo

Ernie Lo is a qualified web designer and web developer. He works as an IT support technician and website manager at Benleigh Vending, and he also fixes vending machines.

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