Mobo doesn't boot with gpu 6600 xt

Hello, this is my first post. I’m building my first rig. My setup is :motherboard Q270 Pro BTC+ ASRock, CPU Intel Core I3-6100 CPU @ 3.70GHz AES, ATA BIOSTAR S100-120 120GB. Everything works fine untill i put my first GPU (RX6600 xt).
The rig doesn’t boot despite the fan of the cpu and gpu works.
During the bios config on the mobo I’ve selected enable 4g and pcie speed GEN1.
Any suggestions?

Try to disable CSM.

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