I have an old hp pavilion dv6 and I installed windows 7. Then i tried installing Ubuntu 24.04 and the USB wouldn’t boot, it just showed “GRUB” in the top left of the screen. I tried with another USB and the same issue emerged. Is this a BIOS issue?
It may be an issue with the bios not setting up the USB drive like grub expects… Maybe try booting with uefi if you can?
I think those symptoms mean it’s loading the first stage of grub but them grub can’t find the rest of itself
I second AsudoxDev’s idea that it may be worth using a different flash tool or a different USB drive if you can’t get it working.