Encountering issues with two distinct i5 9400F processors not functioning on the motherboard, even though both are listed on the AsRock compatibility chart and the BIOS is running the most recent update.

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Troubleshooting a Compatibility Dilemma: i5 9400F and AsRock B365M Pro4 Motherboard

When it comes to building or upgrading a computer, compatibility among components is crucial. Recently, I encountered a perplexing issue that I’d like to share, in hopes of garnering insights from the community.

The Setup

In this particular scenario, we were facing challenges with a newly assembled PC that refused to boot. Initially, the culprit was identified as the Intel i5 9400F processor, which, as it turns out, requires a specific BIOS version to function correctly with the AsRock B365M Pro4 motherboard.

To resolve this, I temporarily used my i7 8700K to update the BIOS to the latest version available (P4.40). Following this update, I was confident that the setup would be compatible, as the AsRock compatibility list does include the i5 9400F.

The Ongoing Issue

Despite having the latest BIOS installed, the build continues to fail to boot, even after attempting to use two different i5 9400F processors. This situation is particularly frustrating given that the motherboard’s official documentation explicitly states that this CPU should be supported.

Seeking Solutions

If anyone in the community has experienced similar issues or has any troubleshooting suggestions, I would greatly appreciate your input. What other steps might I take to resolve this problem? Any advice or insights would be highly valuable as I navigate this compatibility conundrum.

Thank you in advance for your assistance!

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One Comment

  1. Hi, thank you for sharing your detailed setup and the steps you’ve already taken. Since you’ve confirmed that both i5 9400F processors are on the AsRock compatibility list and you’ve updated the BIOS to the latest version, here are some additional troubleshooting steps you might consider:

    • Verify CPU Seating and Power Connections: Ensure that the processors are properly seated in the socket and that all power connectors (CPU power cable) are securely connected.
    • Clear the CMOS: Sometimes, residual BIOS settings can cause boot issues. Try resetting the motherboard CMOS by removing the battery for a few minutes or using the clear CMOS jumper.
    • Test with Minimal Hardware: Boot with only the essential components: motherboard, CPU, one RAM stick, and power supply. This can help identify if other peripherals or hardware are interfering.
    • Check for Physical Damage: Inspect the CPUs and motherboard socket for any visible physical damage or bent pins.
    • Update or Re-flash BIOS: Even though you mentioned updating the BIOS, consider re-flashing the BIOS or trying a BIOS recovery method if available to rule out a corrupted BIOS flash.
    • Test with Known Working CPU: If possible, test the motherboard with a different compatible CPU that is known to work, to confirm the motherboard’s functionality.
    Reply

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