Why do I get a black/purple screen when booting on a brand new PC build?

After playing and searching around, I found that I could enter the GRUB menu by holding down F11, then pressing "e" on "install ubuntu" i then looked for where it said "quick splash --" and changed it to "nomodeset $vt_handoff" this allowed my system to boot it all up and after installing I played around with the /etc/default/grub file and changed around some text to allow my system to boot up right to Ubuntu.