iPad screen has pink vertical stripes and will not turn off or reboot.

Begin with a forced restart of your iPad.

connect your iPad to its Power Adapter and allow the iPad to charge undisturbed for at least an hour. Then, while still connected to external power, try a forced-restart:

Force restart iPad (models with Face ID or with Touch ID in the top button)

If your iPad doesn’t have the Home button, do the following:

1. Press and quickly release the volume button nearest to the top button.
2. Press and quickly release the volume button farthest from the top button.
3. Press and hold the top button.
4. When the Apple logo appears, release the top button.

Force restart iPad (models with the Home button)

Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.

If iPad still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPhone, iPad, or iPod touch won’t turn on or is frozen. Or if your iPad isn’t working correctly after you restart it, see the iPad Support website.

After your iPad successfully restarts, you’ll need to establish whether or not you have a screen hardware fault…

You can easily determine if you have a hardware or software issue. A reliable method to confirm a screen or other hardware fault is to take a screenshot when the fault is evident - and then review the captured screenshot image...

When reviewed, if the lines are not present in the screenshot image, then you have demonstrated that you have a hardware fault that, sooner or later, may become sufficiently severe that repair or replacement of the iPad are the only options. If the lines are visible in the screenshot, the something other than hardware will be the cause.

Note: When reviewing the image, rotating the iPad screen orientation by 90°, from Portrait to Landscape, will ensure that the image does not coincide with screen defects if present.

Take a screenshot on your iPad – Apple Support

If the test indicates that a hardware fault (as, given your description this is very likely) a visit to the Genius Bar at your local Apple Store is recommended - where the technicians will be able to test and assess your iPad. This will likely inform your next steps:

Genius Bar Reservation and Apple Support Options - Apple

iPad Repair – Official Apple Support

Hello dpesquire,

If your iPad is still unresponsive you can find the best steps to take here: If your iPad won't turn on or is frozen - Apple Support

"On your iPad without a Home button

1. Press and quickly release the volume button closest to the top button.
2. Press and quickly release the volume button farthest from the top button.
3. Press and hold the top button until the device begins to restart.
4. If your iPad doesn't turn on, follow these steps to check your hardware and charge your device. You might need to charge for up to an hour.
5. If your iPad still doesn't turn on, contact Apple Support."

Should the issues persist, specifically any issues with the display, it will likely be necessary to have your device serviced. Steps 4 and 5 can help you isolate and explore those options!

Take care.