Hello! I have a problem with my PC, the cpu light came on.

Troubleshooting CPU Light Indicator on MSI B550-A PRO Motherboard

If you are experiencing a persistent CPU warning light on your MSI B550-A PRO motherboard, it can be concerning, especially when your PC is not booting as expected. This guide aims to help you understand potential causes and provide step-by-step troubleshooting tips to resolve the issue.

Understanding the Situation
Your system’s motherboard has a diagnostic LED indicator that signals specific hardware issues. In your case, the CPU indicator light has turned on, suggesting a problem related to the processor or its connection. Notably, you mentioned that you previously saw a boot LED light but now only see the CPU warning, indicating a change in system status that warrants further investigation.

System Specifications
– Motherboard: MSI B550-A PRO
– Processor: AMD Ryzen 5 4500
– Memory: 16GB DDR4 RAM at 3200MHz
– Power Supply: XPG PROBE 700W

Initial Actions Taken
You have already attempted reseating the CPU, which is a good first step. Since the issue persists, further troubleshooting is necessary.

Possible Causes and Troubleshooting Steps

Verify CPU Seating and Connections
Power off the system completely and unplug it from the power source.
Carefully remove the CPU socket cover and check for proper seating of the Ryzen 5 4500.
Ensure that there are no bent pins on the CPU or the motherboard socket.
Reseat the CPU, applying even pressure to ensure it sits properly in the socket.
Reinstall the CPU retention arm securely.
Check for BIOS Compatibility
Confirm that your motherboard’s BIOS version supports the Ryzen 5 4500. Some newer CPUs require a BIOS update.
If possible, update the BIOS using a compatible processor or use BIOS Flashback feature if your motherboard supports it.
Inspect RAM Modules
Test the system with one RAM stick at a time in different slots to rule out faulty memory.
Ensure RAM modules are properly seated. Faulty or incompatible RAM can sometimes cause CPU errors.
Test Power Supply and Connections
Verify that all power connectors (24-pin motherboard and 8-pin CPU) are securely connected.
Test with a different power supply if available to rule out PSU issues.
Reset CMOS Settings
Reset the motherboard’s BIOS by clearing the CMOS.
This can typically