you had me watch how to install a 10" screen the 10" does require the extra power cable so you see how old this 3D Prints for the onefinitycnc This is how long that power cord has not been needed. anyone that would have printed that would have had this issue BACK THEN the 7" one is the one that i have. look at power requirements it only requires the usb for power for the 7" NOT THE 10"