From an idea of to this post:
https://forum.qubes-os.org/t/kernel-panic-during-installation-on-amd-7840hs-with-780m-igpu/21104/11
you can add: loglvl=all guest_loglvl=all to the end of the GRUB_CMDLINE_LINUX.
I guess you have created your usb installation with dd ?
https://www.qubes-os.org/doc/installation-guide/#linux-iso-to-usb
This user resolve his problem by using Fedora Media Writer.
https://forum.qubes-os.org/t/installation-problem-i-got-this-message-from-grub-minimal-bash-like-line-editing-is-supported/21068/2
I know your problem is not with the installation, but it worth trying several method.
Don’t limit yourself to this forum.
You could try searching on a search engine with some keywords like that:
fedora HP Pavilion M6-1076LA black screen
fedora HP Pavilion black screen
fedora block on Loading initial ramdisk
Hardware problem is always hard and boring to debug sometimes. 