Error while boot install USB

[davidchoi]

[video=youtube;1kreck7bnFg]https://www.youtube.com/watch?v=1kreck7bnFg[/video]

I cannot boot El capitan install USB what should I do?
Need help

 

[ebm]

Try using the boot argument nv_disable=1

This helped me get the OS installed. When I booted from the key that did not work and I had to use the following flags:
GraphicsEnabler=Yes PCIRootUID=0