ASUS TUF B550-PLUS: no display from HDMI or DisplayPort

Check the exact board and graphics source

This guide covers the ATX TUF GAMING B550-PLUS, without WIFI or an M suffix. Write down the complete CPU name and check whether that processor has integrated graphics. The presence of a motherboard video connector alone does not establish that it can produce a picture.

If the PC uses a discrete graphics card, connect the monitor directly to a socket on that card. These connectors are on the expansion-card bracket, separate from the motherboard's USB and Ethernet panel. Select the same HDMI or DisplayPort input in the monitor menu. For the first check, use one monitor and a direct cable, without a dock or adapter.

If this restores the BIOS screen, the original symptom was a display-path problem. Installing an AMD chipset driver would not have changed where the monitor was connected.

Read the persistent Q-LED before moving parts

The model has separate CPU, DRAM, VGA and BOOT Q-LEDs. A light that stays on provides a direction for diagnosis; it is not proof that the named component needs replacing. Brief activity while the board starts is different from a persistent stop.

For a VGA indication, check the selected graphics source, the card's seating and its required power connections. A CPU indication after a processor upgrade calls for an exact CPU-support and minimum-BIOS check. A BOOT indication concerns the boot device and should not be treated as a request to buy a graphics card.

Record the final label, rather than describing every illuminated part as a red motherboard light. Decorative lighting and the FlashBack status LED serve different purposes.

Use this board's documented one-DIMM position

If the DRAM indicator persists, shut down, switch off the PSU and unplug mains power before touching memory. For this exact model, the manual's recommended single-DIMM diagram uses DIMM_B2. The two-DIMM diagram uses DIMM_A2 and DIMM_B2. Do not substitute an A2-first rule taken from a different motherboard.

Try one module in B2 with memory overclocking disabled. Test the other module in the same socket under the same conditions. This comparison is more informative than moving several modules and changing the graphics card together. If both work separately, return the matched pair to A2/B2 and repeat at default settings.

Separate firmware compatibility from a Windows problem

No image even when entering UEFI happens before the normal Windows graphics driver loads. Check the CPU support page and installed BIOS version if those are known, especially after replacing the processor. Do not select firmware for a WIFI, B550M or later numbered variant.

If a BIOS image appears but the screen goes black only as Windows starts, record that transition and investigate the operating-system/display path separately. You have already shown that the system can display firmware.

Know when to stop swapping components

After a direct monitor connection and the controlled memory check, preserve the results: CPU, BIOS if available, graphics card, cable destination, module tested and persistent Q-LED. If the same stage still fails, use those observations when asking ASUS or a repair technician for help. Avoid repeatedly removing the CPU or shorting unidentified headers; those actions can introduce another fault without resolving the original one.