Expert Guide: Fix CPU Not Detected/Found by Motherboard

The computer cannot start? It may be that the CPU is not detected! This article will give you a detailed explanation of the reasons why the CPU has not been detected and the solutions.

CPU not detected

Assembling a computer may seem simple, but for computer novices, mistakes are inevitable. The CPU not being detected is one of the common problems that may be encountered after assembling a computer. There are many reasons for this problem, including:

• BIOS is outdated.
• BIOS setting error.
• Improper connection.
• CPU is damaged.
• Incompatible with motherboard.

How to solve the problem that the CPU is not detected?

Method 1: Reset the BIOS

The incompatibility of BIOS with CPU may be the reason why the CPU is not detected. Resetting the BIOS can easily solve this problem. The steps are as follows:

Step 1. Turn off the computer and disconnect it.

Step 2. Remove the chassis side panel.

Step 3. Locate the round silver battery (CMOS BIOS battery) and press the metal card on the side to remove it.

Step 4. Remove the battery for a few minutes and let the power supply discharge.

Step 5. After that, put the battery back to its original location and the BIOS will be reset.

Method 2: Reinstall the CPU

Make sure the CPU is properly installed in its slot, otherwise it may cause the CPU to not be detected. The steps to reinstall the CPU are as follows:

Step 1. Disconnect the CPU heatsink.

Step 2. Unscrew the radiator and remove it.

Step 3. Tap the metal handle on the slot and pull up to release the CPU.

Step 4. Check whether there are curved pins on the slot. If not, align the small golden triangle on the CPU corner with the triangle on the slot.

Step 5. After the CPU is in place, push the metal handle back to its original position.

Step 6. Restart the computer and check if the CPU has been detected.

Method 3: Update the BIOS

To detect old or new CPUs, the motherboard needs a suitable BIOS. Fortunately, some motherboards have BIOS Flashback capabilities that allow you to update the BIOS via a USB flash drive without installing the CPU. Here are two situations:

warn:

Case 1: It has BIOS Flashback function

Step 1. Go to the official support website of the motherboard and download the correct BIOS file on another computer.

Step 2. After the download is complete, prepare an empty USB flash drive > Go to this computer > Right-click this USB flash drive and select Format > Format it as FAT32.

Step 3. Unzip the downloaded file and add it to the USB flash drive.

Step 4. Then, connect the USB to the Flashback port of your computer.

Step 5. Make sure the computer is turned off and press and hold the BIOS Flashback button for a few seconds.

Step 6. Now, restart the computer and check if the CPU detects that the problem still exists.

Case 2: It does not have BIOS Flashback function

Things can get more complicated if your motherboard doesn't have BIOS Flashback functionality. You need to find an old processor that is compatible with the motherboard to access the BIOS.

See also:

How to update MSI BIOS? — Complete Guide

How to update Intel BIOS? Step by step guide

Use four methods to perform an Asus BIOS update

Method 4: Replace the CPU

If the motherboard slot pins or CPU are damaged, the computer will not boot. You can consider repairing the bent pins yourself or replacing the CPU completely.

Conclusion

The above is the solution to the CPU not detected in Windows 10/11 system. With the help of a professional, please follow the above instructions carefully. Hope this guide helps you!

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