Question Computer will only boot on Onboard Graphics if I have a GPU in the PCIE slot, but not plugged in the six pins.

Jun 26, 2021
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Specs:

Mobo- B450-A/CST Asus
Gpu- Gtx 660 EVGA
Cpu- Ryzen 3 3200G
Ram- 16gb 2400mhz HyperX Fury DDR4
Psu- Termaltake 850w modular

Whenever I try to boot the computer, if my graphic card isn't installed in the pcie slot or the 6 pins connector is connected, I won't be able to boot properly.

Even when using this method, once in on my windows, whenever I try to install the radeon softwares, I get the 0xc000012f error.