Fix a line going up and down ipad mini screen

replace the LCD https://www.sosav.co.uk/store/2444-ipad-mini-4

try holding down the Power and Home buttons at the same time, it will shut off and turn back on, once you see the apple logo again you can let go.

Is the screen broken or is it just the digitiser? There are many excellent videos available which take you through the process of replacing all parts of your iPad.

However, it is not something that can be fixed easily and you need to exercise great patience in dismantling your broken iPad and replacing the damaged parts.

Make sure you have plenty of space in which to work and place all the parts of the iPad around your working area so they are easy to reach.

Good Luck.

Try restarting it: hold power button down until "slide to power off", power off for 10 seconds, press power to restart.
if that doesn't fix it, reset your iPad: hold BOTH power button and Home button until device resets and apple logo appears.

Try removing the battery for 30 seconds.

To check out the mode go to Settings > General > Accessibility and tap Invert Colors on or off.
Read more at http://www.trustedreviews.com/opinions/50-ipad-mini-tips-and-tricks_Page-2#LRv8jSSzqbpZViZm.99 50 iPad mini tips and tricks

After you put in the wrong pass code 3 times, you only can unlock the iPad with the correct password, belonging to the Apple ID from what is only a part shown on the screen. If you don't have the passcode nor the password Apple assumes you are not the legal owner, and you can't use the iPad anymore. Just go back to your friend, ask him to unlock the screen, to wipe the content and reset the iPad to factory settings.
For that goto settings, general and scroll to the bottom line and press that. then the second line wipe everything. Again the login code is asked. but after that the iPad is empty.Your friend should also remove the iPad from his list of registered Apple equipment.

Is it really gone? From the home screen, swipe down from middle of the screen to show iPad search. Type "App Store" in the search box. Scroll down to Applications section. Is App Store there? If so, it's on your iPad - perhaps dragged into a group somewhere.

If not, plug your iPad into the desktop Mac or PC you're using to sync. Select the iPad in the left column and click the Apps header. Scroll the list until you find the App Store app. The button should say "Install". If so, click it, then sync your iPad.

What wrong with your iPad 3? Maybe you can reply on the tablet replacement repair parts for iPad 3 to make your iPad return back new and health. Nowdays, there are more repair parts for fixing the unflexible and scracked.