How to Fix Xhorse Condor II Machine Screen No Response?

On a customer's feedback, his Xhorse Condor 2 Machine won't respond on the screen. He could not select language and use this machine.
turn on machine
select language
no response
Open screen and check cables.
1)Remove the six screws
remove screws
2)Open cover and make sure the two cables are connected well.
check two cables