Kali Linux boots only when USB is plugged in

Hello I need a little help hopefully somebody can point me in the right direction.

I was having problems getting my macbook pro mid 2010 to boot from usb (to install Kali Linux), after selecting under REFind the installation usb a black screen appeared with the message “No bootable device”…

So I saw a post about changing the default menu string from syslinux.cfg file under the usb /EFI/BOOT/syslinux.cfg from something like vcmenu.c32 to just menu.c32 so after I did that I was able to boot from the usb in my mac…

Kali Linux installation went smoothly and when I tried to login (with a successful login) the system just crashed/freezed. After many unsuccessful start up of Kali Linux I tried to start up with the installation usb connected to the machine and I was surprised to see that I was able to log in and start the system and worked pretty good.

So my question is how can I start the system without the usb plugged into the Mac?.

Thanks and sorry for my bad english I’m from México