You have used the tools that we suggested to load Elive on it, most of the “bootable maker tools” changes the internal structure of the system, which is not reliable most of the time (and in very small cases it can help you to make to boot it)
Some computers can only boot from one of their USB ports, make sure to try from all of them if doesn’t boots
If these solutions fail, try to upgrade your BIOS firmware
Apple / Mac users: You will simply need to power-on the computer with the USB stick inserted while the Option/alt(⌥) key is pressed.
No USB boot?
– You can try the “plop linux bios extender” boot loader which can help making it boot on old computers – Use the “changedevice” boot parameter to continue the boot from USB if you booted from CD (note: USB 1.0 are extremely slow!)