Chosen Solution
Replaced the 3.5 jack and harness, as I’ve done 2 other times. This time though, when i powered back up, the screen was white with a few dark blueish verticle lines on left side of screen and small horizontal lines on entire screen. What could have happened??
try this Press and hold the home button, then the up-volume button, then the sleep/power button (so all three buttons are now pressed and held) — it takes a while, but the white screen will go away and then after another 10 seconds or so (still holding btw!) the apple logo will come up, release the buttons and then wait, it’ll boot normally again in a minute or two.
Try disconnecting the LCD connector and reconnecting it (make sure the battery is disconnected while you do this) just in case it came loose. If that doesn’t work, then you will need to replace the screen.
