Amazon Basics DisplayPort to HDMI Cable, Uni-Directional, 4K@30Hz, 1920x1200, 1080p, Gold-Plated Connectors for Enhanced Picture Quality and Sound, 6 ft, Black

If your BC-250 came with a SATA SSD, like mine did, make sure to remove it as well. As long as there is no SSD, no USB drive, and a working DP cable, you should be put right into the BIOS. For DP to HDMI cable, I use this one off Amazon. I've used it on two HDMI monitors and a TV. Each one would show the BIOS when connected barebones. https://a.co/d/08S1ecVQ

https://a.co/d/095k7qxl this is the cable I use on all of my BC-250 builds

I use a DP to HDMI cable from the jungle site its 1m https://a.co/d/095k7qxl