what are specs of PC?
On another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB
see if it does same thing in safe mode:
boot from installer, on 2nd screen after languages, choose repair this PC, not install
choose troubleshoot
choose advanced
choose start up options
hit the restart button
choose a safe mode (it doesn't matter which) by using number associated with it.
PC will restart and load safe mode
is line still present? did it show while booting into blue menu?
check device manager and see if any unknown devices or yellow triangles (these are warnings or alerts)