How did you solve the problem with the d6 code?

[Killermachine02]

Since the computer starts, it turns on the fans and everything is fine but it doesn't give an image and the GPU is connected and it marks me the code d6

[DarvinAtkeson]

That might be a memory error code.  
Try reseating the memory chips.
Try reducing the number and make sure you have them in the correct slots.  
Try one DIMM module at a time. 

[Silent_Scone]

Hi @Killermachine02 

Very vague. Can you provide full system specs?

Are you able to use iGPU if available? Reseat the GPU and check all power connectors are fully inserted, and, if applicable, check power LED indicator on GPU.

[Jiaszzz_ROG]

Hello @Killermachine02 

Thank you for reaching out to us.
May I kindly inquire about the model of the motherboard you are currently using? The issue where no display is shown and Q-code D6 appears can differ between Intel and AMD platforms. 
We recommend referring to the [Motherboard] Common Q-CODE (Error CODE) and Troubleshooting guide, as well as the user manual provided on the motherboard's official support page, to ensure that all hardware components are correctly installed.

Thank you.

[The-Pack]

Hello @Killermachine02 

If you have a KF CPU, this can also indicate a graphics card that is not working properly. I had this with my RTX 4080. VRAM was defective. I constantly had a d6. Maybe use a different graphics card as a test and then try again. 

Otherwise it is a "RAM" problem. The wrong slot, not compatible, XMP not stable, whatever has to do with RAM. Then there is a "search until found"