So, on the other PC I installed a new CPU and suddenly a yellow light shows up on the 16x slot.
I do the usual, but bothing works.
I try my gpu from my main pc and no difference.
I place my gpu back into my main pc and now suddenly it has the same issue.
Tried:
Reseating RAM, 1 stick at a time.
Reseating CPU with, cleaning off (with noctua wipes) and replacing thermal paste each time.
Cmos Battery.
Reseating GPU like 15 times.
Waiting.