B550 Gaming Plus CPU Light On – Causes & How To Fix In 2023

The B550 Gaming Plus motherboard is designed for gamers and enthusiasts. However, like any other piece of hardware, it may encounter issues from time to time. One common problem that users may face is the CPU light turning on. 

To fix the B550 Gaming Plus CPU light issue, check for bent CPU pins, ensure proper CPU installation, update the BIOS, and test with compatible components like RAM and GPU.

In this article, we’ll discuss the possible causes of this issue and provide troubleshooting steps to help you resolve it.

Source: reddit

Causes Of B550 Gaming Plus CPU Light On:

1. Loose CPU Socket:

One of the most common reasons for the CPU light to turn on is a loose or improperly seated CPU. If your CPU isn’t securely inserted into its socket, it may not make proper contact with the motherboard, leading to connectivity issues.

2. Bent CPU Pins:

Another common issue is bent or damaged pins on the CPU or the motherboard’s CPU socket. These highly delicate pins can quickly become damaged during installation or transportation.

3. Incompatible CPU:

Ensure that your CPU is compatible with the B550 Gaming Plus motherboard. Installing an incompatible CPU can turn on the CPU light and prevent your system from booting correctly.

4. Insufficient Power Supply:

Inadequate power supply can also trigger the CPU light. Make sure your power supply unit (PSU) is capable of delivering enough power to your CPU and other components.

5. Overheating: 

If your CPU is overheating due to inadequate cooling or improper thermal paste application, it can cause the CPU light to turn on as a safety precaution. Overheating can damage your CPU and other components.

How To Fix B550 Gaming Plus CPU Light On?

Now, let’s tackle the CPU light issue step by step:

1. Check CPU Installation: 

Check CPU Installation
Source: itec226pro

Ensure that your CPU is seated correctly in its socket. Gently remove and reseat it, ensuring it aligns with the socket’s notches and locking mechanism.

2. Inspect CPU Pins: 

Carefully examine the CPU and the motherboard’s CPU socket for bent or damaged pins. If you find any, it’s crucial to address this issue. Bent pins can often be straightened using a small tool, but damaged pins may require professional repair or replacement.

3. Verify CPU Compatibility: 

Double-check that your CPU is compatible with the B550 Gaming Plus motherboard by referring to the motherboard’s official documentation. You may need to upgrade or replace the CPU or motherboard if it’s incompatible.

4. Test with Minimal Hardware: 

To rule out potential issues with other components, try booting your system with the minimum hardware required—CPU, one RAM stick, and the GPU. Gradually add components back in until the issue reappears.

5. Check GPU Connections:

Ensure that your GPU is securely seated in its PCIe slot. Loose connections can prevent the system from displaying anything on the monitor. Verify that the power connectors to the GPU are correctly attached.

6. RAM Configuration:

RAM misconfiguration can also trigger the CPU light issue. Properly configuring your RAM is crucial. Refer to your motherboard’s manual and ensure your RAM modules are installed in the recommended slots. In many cases, using slots 2 and 4 (DIMMA2 and DIMMB2) is ideal for dual-channel memory. For troubleshooting purposes, try booting with just one stick of RAM to eliminate potential memory-related problems.

7. Clear CMOS:

Reset your motherboard’s CMOS settings by performing the following steps:

  • Disconnect the power from the wall and the display.
  • Remove the CMOS battery from the motherboard.
  • Press and hold the power button for 30 seconds to discharge any residual power.
  • After about 30 minutes, replace the CMOS battery.
  • Reconnect the power and attempt to power up the system.

8. Monitor Connections:

Carefully inspect all monitor connections, including the video cable (HDMI or DisplayPort), and ensure the monitor is set to the correct input source.

9. Debug LEDs/Beep Codes:

Pay attention to any debug LEDs or beep codes provided by your motherboard. These indicators can offer valuable information about the problem. Refer to the motherboard manual for guidance on interpreting these codes.

10. BIOS/UEFI Updates:

Source: how2do

Ensure you have the latest BIOS/UEFI firmware installed on your motherboard. Newer CPUs often require BIOS updates for compatibility. If necessary, use a compatible CPU to update the BIOS.

11. Power Supply:

Confirm that your Corsair CX Series 650M power supply delivers sufficient power to all components. Ensure that all power connectors are correctly plugged in.

12. CPU and Socket:

Carefully inspect the CPU socket on your MSI B550 Gaming Plus motherboard for any debris or bent pins. Ensure that the CPU cooler is correctly installed and making good contact with the CPU.


Is It Possible To Fix The CPU Light Issue Without Replacing Any Components?

Yes, fixing the CPU light issue without component replacement is possible. Try BIOS updates and reseating components like the CPU to resolve the problem.

What CPU Does B550 Gaming Plus Support?

supports AMD Ryzen 5000 & 3000 Series (Ryzen 5 3400G & Ryzen 3 3200G are incompatible) and Ryzen 4000 G-Series desktop processors. Use a USB key to quickly flash any BIOS using the flash BIOS button with improved clear CMOS functionality.

Is B550-Plus Compatible With Ryzen 5 5600x?

The AMD Ryzen 5 5600X Six-Core 4.6GHz ASUS TUF Gaming B550-Plus Motherboard CPU Bundle will enhance your gaming experience. The Ryzen 5 5600X processor, which offers super-fast speeds and seamless multitasking, is part of this potent combination.

Will B550 Support Ryzen 5000 Without BIOS Update?

To enable compatibility for these new processors on your AMD X570, B550, or A520 motherboard, an updated BIOS might be necessary. Without a BIOS of this kind, a system with an AMD Ryzen 5000 Series Processor installed might be unable to boot.

Can The CPU Light Indicator Be Disabled On The B550 Gaming Plus Motherboard?

No, the CPU light indicator on the B550 Gaming Plus motherboard cannot be disabled. It is a crucial diagnostic tool to identify and troubleshoot potential CPU-related issues within the system.


Troubleshooting hardware issues in a PC build can be challenging, but systematically checking each component and following best practices can often identify and resolve the problem.

Remember always to handle your components carefully, ground yourself to prevent static discharge, and stay patient throughout the process. With diligence and persistence, you can get your MSI B550 Gaming Plus motherboard up and running smoothly.