Fastboot mode in my violet is blacked out

The thing is when I get my phone into fastboot mode the interface is like nothing totally blacked out. But I thought of connecting it with my Pc and my Pc is detecting it successfully but at last when wrote the commands to detect the fastboot it isn’t showing up I’m very frustrated I cunt change my custom recovery. My custom recovery is showing some errors so I also cunt change my rom also🥺🥺