Chosen Solution

hello, i have an iPhone 5, my power button wasn’t functioning properly, so i decided to fix it and i did. after puting all things back and start the phone i had a few lignes on the screen, so i opened it again to check the connectors. after closing it again, the screen become black ! i don’t know what happened ! the phone appears when i plug it to my laptop any advices ? thank you

i changed the screen and it is working fine now , i might damaged the old one . thanks

try disconnecting the battery and power, then reconnect the battery with screen plugged in and power it on.