Question gigabyte x299 designer socket2066 troubleshuting with A6 code

May 1, 2019
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I have homemade comp that day before was starting. Today I have codes at first 73 than A6 and now 6C. Screen is not responding, cant see anything. I don't know if DEL get me to BIOS or no. Changing graphic from PCIE 2 to PCIE 1, lead me to code 6C again. Help.

Specyfications:
Motherboard: Gigabyte x299 designare socket 2066
Procesor: intel core i9
RAM: DDR4, 4x16GB
CPU cooling: Corsair watercooling
Graphic card: Nvidia GTX 650
SSD : Samsung EVO 970 250GB and 1T
Powering : EVGA 750W gold