Thanks guys.
It gets past BIOS it just halts when it starts to boot windows 10. This is a second hand laptop with a fresh install and the person who installed Win10 did it using the BIOS boot loader instead of UEFI I might try converting Win10 to UEFI to see if that helps but I doubt it.
I have googled around a bunch but unfortunately “black screen with cursor” is the result of a very many problems and I haven’t found anyone else saying a USB device is causing it. It’s really weird.
I just double checked and I do have the most current BIOS “A29”
Thank you for your responses.