Question Black screen at start / VGA debug LED on

Dec 29, 2022
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Hi !
Here's my problem: two days ago I started my pc as usual (not a new one) and I got a black screen and the vga debug led was lit on my MC. Two weeks ago I suppressed a dual boot and then a formatting to do a clean install.
Config:
HKC 550V
MSI x470 gaming pro carbon
NVidia GTX 2070
AMD Ryzen 7 2700
2x Corsair DDR4 8Go
Windows 11

I already tried to remove the battery to clean the CMOS (>3 min), tested the ram, tried the CG on another slot, tried another CG (RTX 3070), tried to start the pc with DP/HDMI unplugged. The RTX 3070 start their fans but when the VGA debug led turns on, they stop.
I can't access the BIOS neither.
Thank you in advance