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CPU overheats on startup: Here’s What We Going To Do To Fix It?

Have you ever thought about why your CPU overheats on startup? The central processor unit (CPU) and graphics processing unit (GPU) are the two components of hardware in any computer that generate the greatest heat.

The amount of heat produced by a CPU (or a GPU) is determined by its power demand. A higher power draw typically translates into greater performance.

However, if the temperature of a CPU exceeds its maximum limit, it might begin throttling and overheating, culminating in a system shutdown. If you’re experiencing CPU overheating, here is the place to look for a solution.

CPU overheats on startup: Here’s What We Going To Do To Fix It?

Fix 1: Dust Off the Cooler

Any CPU from the last ten years cannot function without active cooling. In other words, your PC most likely has a cooler.

Dust will almost inevitably begin to accumulate within the system over time. The dust that builds in the computer is usually not a big issue, but it may become one if left untreated for an extended period.

Here’s a straightforward way to clean your computer:

  1. Bring your computer outdoors (there will be a lot of dust).
  2. Remove the screws from your computer’s side panel (a screwdriver may not be needed if there are thumbscrews).
  3. To remove dust, use an anti-static microfiber cloth, compressed air, or an electric blower.
  4. The CPU coolers, their fans, and the case fans should be your immediate attention. Remove the cooler’s fan if necessary for thorough cleaning.

Fix 2: Troubleshoot Your Air Cooler

If cleaning the whole computer does not improve thermal performance, the issue might be with the cooler itself. But hold on. That doesn’t imply you should go out and get a new cooler right now.

Fix 2.1: Check If The Fan Is Working

First and foremost, you must ensure that the fan is operational. You’ll have to open it up if you don’t have a PC case with a window/glass panel.

So, leave your computer running and open the side panel to check if the fan on the CPU cooler is spinning. If it isn’t, try playing a game to confirm that the CPU reaches the temperature threshold that causes the fans to spin.

After all this testing, the fan still does not spin; you will need to replace it.

Most CPU coolers, fortunately, include interchangeable fans that can be replaced with any other fan you can find. Ensure that it is the correct size.

Fix 2.2: Make Sure CPU Fan Is Plugged In

Perhaps the fan isn’t rotating because it isn’t connected. This may happen when a computer is moved around or is never properly plugged in, so it eventually loses adequate contact.

However, before you begin tinkering with the PC, be certain that it is entirely switched off this time. Also, turn off the power to the PSU by pressing the button on the rear of the chassis. We also propose repeatedly pushing the case’s power button to drain all capacitors of power.

You may now reach inside the PC securely and check for the fan cable. Follow it to the conclusion to check if it’s clogged anyplace. If it isn’t, search for a 4-pin (occasionally 3-pin) header with a CPU Fan written around it.

Fix 2.3: Adjust Fan Curve


When the CPU fan spins up as expected, but you still have overheating issues, the fan curve on your PC may be too gentle. You may change your computer’s fan curve using the software or BIOS on your motherboard.

AI Suite for ASUS boards, SpeedFan, Easy Tune for Gigabyte, Argus Monitor, NZXT CAM, and more programs are available.

If the program does not detect your fans, you should utilize your BIOS to control them. Start your computer and pound the F2, Delete, or F10 keys to access your system’s BIOS (depending on the motherboard brand).

Fix 3: Troubleshoot Your AIO

They are also more costly and have more potential failure points, including the pump, tubes, radiator, and fans. Although today’s AIOs are significantly safer and more durable.

However, it is still feasible that the AIO is causing CPU overheating in your system, so let’s investigate!

Fix 3.1: Ensure the Pump Is Plugged In

The pump is the most critical component of any water cooling loop. Its job is to pump water into the radiator, which cools before being drawn back into the pump to cool the CPU.

There is a danger of CPU overheating if the pump is connected to the incorrect header or is not connected at all.

Use the same instructions above about connecting the CPU fan to verify that. Instead of searching for the CPU FAN header, try looking for the CPU PUMP header this time. Because it cannot be regulated and always operates at 100%, this header is ideal for AIO pumps.

Fix 3.2: Ensure the Pump Is Running At 100%

This step is critical for any system that includes an AIO. The pump must run at maximum power to guarantee that water goes through the water cooling loop as often as possible. Otherwise, your CPU may get overheated.

You don’t need to do anything if your pump is linked to the CPU PUMP header since it is already operating at 100%.

Fix 4: Check And Replace Thermal Paste

Thermal paste is an important component of every modern computer. Both GPUs and CPUs may overheat without it.

Thermal paste’s function is to fill gaps between a processor’s IHS (integrated heat spreader) and a cooler’s cold plate. Heat may be transferred considerably more effectively by reducing the air spaces between these two metal objects.

Again, make sure there’s no power to the computer!

Here’s a brief reference guide to help you through the process:

  1. Start your computer and let it run for a few minutes to warm up the CPU. Please do not skip this step! This process softens the thermal paste, making it simpler to remove from the cooler.
  2. Remove the side panel of your PC and the four screws on each corner of the cooler.
  3. Begin slowly moving the cooler towards you. After removing the cooler, store it and leave the CPU in its socket.
  4. Grab a piece of dry toilet paper and softly clean the CPU before soaking another piece of toilet paper in isopropyl alcohol and gently rubbing off the remaining thermal paste.
  5. Finally, take a pea-sized dot of thermal paste (which normally comes in a syringe) and place it in the center of the processor.
  6. Screw the cooler back in place, connect the fan/pump, and restart your computer.

Fix 5: Stop Your Overclocks

People seldom overclock their CPUs, but if you are one of them, it is time to dial it down a notch.

That increased power pouring into the CPU might be causing it to overheat. So, it’s time to reset your CPU whether you’re using overclocking software or overclocking via your BIOS.

The simplest method is to enter your BIOS and press the reset to defaults button. This will reset your CPU, RAM overclocks, and any other BIOS settings.

Fix 6: Add More Case Fans

We’ve gone through the options that work for the majority of individuals. However, if your CPU is still overheating, you may need to invest a few bucks in a proper solution. Adding extra case fans is the cheapest approach to address all of this.

More intake and exhaust case fans help enhance air circulation around your CPU, lowering temperatures. If they don’t have RGB, you can get a couple of fans cheaply. Regrettably, RGB fans are often more costly.