Vega 64 Black screen AFTER bios

Feb 4, 2019
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Hi guys, I'm facing a problem with my Sapphire AMD Vega 64.

When i power up my pc, the BIOS screen shows up and then it comes a black screen, and the gpu fan start to spin at full speed.

No overclock in gpu, cpu, ram.

I Will come back at home on tuesday, and then i can try your solutions.

Motherboard: Gigabyte AB350 Gaming 3 (Last BIOS version)
CPU: Amd Ryzen 5 1600

Thx for your help!

[video="https://www.youtube.com/watch?v=7pqa2zvvTbQ&feature=youtu.be"][/video]