I just installed Slackware 14.2 and after the mandatory reboot it goes back to the bios startup screen and alternates between this and a blank screen. I used a gigabyte B450M DS3H. 16GB of ram and a 1tb crucial ssd.

Some more information might be helpful. E.g., What is your partition setup? Which bootloader are you using? (grub, elilo, etc.)

I have a 100MiB EFI Filesystem, a 32GiB root partition and an 899.4GiB home partition. I'm using elilo but from the live environment eliloconfig outputs nothing.

Ok, I was able to make it boot from a usb but now it is giving me kernel panics.

OK. Assuming you have all the boot files present on the EFI partition, you can easily create a simple elilo.conf file manually. Here's a sample that I used on an EFI laptop recently:Just adjust for your kernel version and root device.

Note: Some EFI systems I've encountered won't recognize the elilo binary without renaming it. If you're sure you've got all the necessary files on the EFI partition, and still can't boot, try making a copy of "elilo-x86_64.efi" with the name "bootx64.efi" (On some systems, this is the only file-name that will work.)

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How would I go about doing that though? And there is no elilo.conf file present on my system.

OK I got it running! I had to use the nomodeset parameter in booting.