Changed to secure boot now my monitor gets no signal from my computer

Troubleshooting No-Display Issue After Enabling Secure Boot on MSI X570-A PRO Motherboard

Enabling Secure Boot is a common step for users aiming to access certain features or participate in beta testing, such as playing the Battlefield 6 Beta. However, modifying BIOS settings—even seemingly straightforward ones—can sometimes lead to unintended hardware or display issues. In this article, we’ll explore the scenario of a user who encountered a “no-signal” problem on their monitor after enabling Secure Boot and discuss potential solutions.

Understanding the Context

The process involved:

• Accessing BIOS (Click BIOS 5 on MSI motherboards).

• Turning off Compatibility Support Module (CSM).

• Enabling Secure Boot in User Mode.

The user’s goal was to prepare their system for beta access, following a tutorial guide. After making these changes, they saved BIOS settings and rebooted, only to find their monitor displays a “no-signal” message. Subsequent attempts to re-enter the BIOS failed, and conventional troubleshooting steps—such as resetting the BIOS via jumper or removing the CMOS battery—did not resolve the issue.

Common Causes for No Signal After BIOS Changes

When system behavior changes unexpectedly after BIOS modifications, potential causes include:

1. Incompatible or Misconfigured BIOS Settings: Enabling Secure Boot alongside disabling CSM can lead to boot issues, especially if the OS or hardware isn’t fully compatible with UEFI mode.

2. Graphics Card Initialization Problems: Sometimes, BIOS changes impact how the GPU initializes, especially if settings such as primary display output are affected or if the GPU is not correctly recognized under UEFI.

3. Secure Boot Restrictions: Certain hardware configurations or drivers may conflict with Secure Boot, leading to boot failures.

Recommended Troubleshooting Steps

Here are systematic steps to rectify display issues after BIOS changes:

1. Reset BIOS to Default Settings

• Use the BIOS reset jumper on the motherboard or remove the CMOS battery for a few minutes, then reinstall.

• This action will restore BIOS defaults, potentially reversing any problematic configuration.

2. Verify BIOS Reset

• Power on the system and see if it posts normally.

• If successful, re-enter BIOS to cautiously reconfigure settings.

3. Reconfigure BIOS Settings Carefully

• Before disabling or enabling features, consult your motherboard manual or official documentation.

• Consider:

• Re-enabling CSM if Secure Boot causes issues — some systems require CSM for compatibility.