Thank you guys and sorry, because it was the riser SATA power connector that has disconnected.
Now the rig is working great.
Good to hear, make sure you use SATA for one GPU only, SATA isn't even advisable for powering powerful graphic cards like 3070Ti and other, I will only use SATA on mid range graphic cards like 1060 super or 6600XT. Now the rig is working great.