My new PC has been working fine without a graphics card installed. The motherboard (Strix Z790-E), CPU (13900K) and RAM (Dominator Titanium 64GB) are all new.
The SSD (Samsung 980 Pro) and PSU (Corsair RM1000x) are from my previous build.
I just tried popping in the graphics card (3090 FTW3) from my previous build, and I’m getting a black screen. The monitor turns on when I turn the PC on, but it just says no signal. I can’t access the BIOS.
I’ve tried unplugging and replugging everything. The PC seems like it’s otherwise running normally, as all the fans are spinning and lit up, and I can hear the AIO pump. The graphics card fans do spin at startup and the RGB is on.
The monitor is plugged into the graphics card’s HDMI port.
AS I WAS ABOUT TO POST THIS:
I tried plugging into the motherboard’s HDMI and the PC started normally, allowing me to get to the desktop. I looked in Task Manager and the 3090 is not listed, only Intel UHD Graphics.
This means that I should be able to get to the BIOS with the graphics card installed, though I’d have to be plugged into the motherboard’s HDMI. Hopefully someone can advise me from here.