Hi,
I have the gigabyte 6900 xt reference card. On every cold boot my motherboard will give me a long beep and 3 short beeps, indicating an issue with the card. However if i manually wake the monitor by pressing the on button on the monitor and then turn on the pc it will boot up as normal.
I can always tell that the pc will not boot as the stand by light on the monitor usually flashes when the pc is off, however it is solid after the pc has been turned off for a long period.
Restarting also boots fine and even if i shut down and leave it for an hour it will boot up fine.
I previously had the vega 64 in this setup which I had no issues just to rule out other hardware.
Pc Specs:
CPU: 3900X
GPU: 6900 XT
PSU: Corsair 1000W
Motherboard: Gigabyte 570x Pro
RAM: Corsair 32GB 3600mhz
Any ideas? let me know if you need any more information, I'm puzzled.