There is not yet a concrete diagnosis, so the solution to this problem could come from several fronts and therefore there will be several solutions which have already been tried and work, but there is still a small group of users who do not have not been able to resolve the problem. Therefore, it looks like we’ll have to wait for a BIOS solution to leave it behind. Either way, we’ll see what options we have to fix the problem.
How to get a B550 or X570 card to give video and signal?
Let’s start by diagnosing the problem, mainly because there are several variations of it: it’s simple, the GPU can’t send a signal to the monitor, either at the start of POST, when trying to enter Windows or Linux, or already in the OS with everything loaded.
Having said that, we go with possible solutions to these problems.
GPU does not output video when entering BIOS or POST
This is a fairly common error that leads a lot to the head and is curiously repeated both with HDMI and DisplayPort, and also with a very particular configuration: all the reported problems are with medium old GPUs.
The direct correlation to this is not yet known, but it may have to do with the fact of PCIe sleep mode and the type of bus version for the GPU, although we insist, it is not clear. AMD is aware of the error and apparently it would have to do with the manufacturers and their motherboard models, as it has not made any statement about it.
The solution seems to be in a BIOS update, where some manufacturers have clarified that it fixes the error, others have not even given a list of changes, while others are still having issues. That is, the ball is in the hands of your motherboard manufacturer and until they have proof of the problem and find the solution, they would not initiate a possible BIOS update.
In fact, it’s more than likely that we’ll end up changing the GPU before this error is fixed, as the number of reported cases is low enough to prioritize it.
No video or signal and with GPU or LED error codes
This is another error quite seen in the forums, as more and more users are having this problem with the B550 or X570 cards. The error seems to be precisely in an electrical bypass somewhere on the motherboard to the chassis and from there to the GPU.
Some report bugs due to frames or tabs in the I / O shield low-end motherboards, so we may need to disassemble the PC from its case, electrically isolate it from any metallic source, and test if the error is resolved.
In case this is the case, it is already a matter of figuring out where the motherboard came from and how to cut off said electrical leakage to the chassis, which can be really difficult in different cases.
There is no signal or video at any time and there are no errors
This is perhaps the most curious and the easiest to repair, because apparently there would be some reluctance from the PCIe 4.0 with PCIe 3.0 of our GPU, where the graphics card could have experienced an electrical surge in the voltages of the video connectors, breaking the HDMI or DisplayPort cable.
It is not explained exactly how this could have happened, but the truth is that the solution is as simple as changing the cable from the monitor to the GPU, or if the connector is broken, switch from HDMI to DisplayPort or vice versa with its corresponding. cable.
Change the PCIe GPU speed setting
Another solution if the GPU does not give any video signal at any time or if an error is logged in the system is also quite simple: change the PCIe version of the GPU to 3.0.
For this we will logically need another graphics card or an APU, because if it is not obvious that we will not be able to enter the BIOS. But once done, it’s as easy as finding the value and changing it from automatic or PCIe 4.0 to PCIe 3.0.
Then we would just have to reinstall our GPU and we would already have video.
Disable processor overclocking
For another reason which is not clear, our PC can work perfectly fine until one day, after applying overclocking, it lacks video signal. The problem seems to lie either in the AMD PCIe 4.0 controller or in the internal clock that the motherboard marks with.
It seems that there is a direct relationship between the speed of the cores, the BMI and the caches with the speed of the PCIe and its modulation, although as we know these are separated in their clocks. Overclocking somehow induces a decoupling in the PCIe controller, so that the GPU cannot give a video signal until the settings are reset.
It could be a problem with the BIOS, with AGESA or even with the signal level on the motherboard, but as we say it is not clear at the moment, but we know that leaving the PC in stock is solved .
Update GPU BIOS
The last option available and which we know has a solution is to update the BIOS of our graphics card. In AMD it’s weirder that this happens, but in NVIDIA until not too long ago Pascal’s GPUs upside down had a version of DisplayPort 1.3.
The company released a patch via software, which recognized our GPU and automatically flashed new firmware to us to switch from DisplayPort 1.3 to DisplayPort 1.4, because on newer monitors flickering could occur or not give a signal directly. because of this.