Troubleshooting Steps

Your AMD Rx 7800 XT graphics card not displaying a signal through the DisplayPort when connected to your monitor, while the monitor works when plugged into the motherboard, here are some potential causes and troubleshooting steps you can take:
Check Cable and Port Compatibility: Ensure that the DisplayPort cable you are using is compatible with DisplayPort 1.4 with DSC, as specified by your graphics card's output specs
. A mismatch in cable and port version can lead to signal issues.

Power Supply Unit (PSU) Adequacy: Verify that your PSU meets the power requirements of your graphics card. Although a 500W PSU might work, it's essential to ensure it provides enough power for all components, especially under load

Graphics Card Seating and Power Connection: Ensure that the graphics card is properly seated in the PCIe slot and that all necessary power connectors are securely attached to the card. A loose connection can cause the card not to function correctly

BIOS Settings: Check your BIOS settings to ensure that the primary graphics adapter is set to the PCIe GPU instead of the integrated graphics. This setting ensures that the system prioritizes the discrete graphics card over the motherboard's integrated graphics

Update BIOS and Graphics Drivers: Ensure that your motherboard's BIOS is up to date and that you have the latest drivers installed for your AMD Rx 7800 XT. Outdated software can lead to compatibility issues.

Resizable BAR (Re-Bar) Support: If your motherboard and graphics card support Resizable BAR, ensure it is enabled in the BIOS. This feature allows the CPU to access the GPU memory more efficiently, which can sometimes resolve display issues

Monitor Input Source: Ensure that your monitor is set to the correct input source. Monitors with multiple input options may not automatically switch to the active input.

Try a Different Display Output: If your graphics card has multiple output ports (DisplayPort, HDMI), try using a different port to see if the issue persists. This can help determine if the problem is with a specific port.
You’ve already tried this

Hardware Fault: If none of the above steps resolve the issue, there may be a hardware fault with the graphics card or the DisplayPort cable. Testing with a different cable or graphics card (if available) can help identify the faulty component.

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