Fix ripped ribbon cable
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The power ribbon cable is one cable that handles powering iPad on, off, sleep, volume, mute functions. One very small section of this ribbon cable is exposed between the frame and digitizer, if you rip this very small fragile cable your iPad will not power on.
The screen ribbon cable isn't replaceable unfortunately. You can purchase a replacement screen for around £45 on eBay, and whilst they claim to be original displays I assume they're LCD knockoffs so battery life could take a bit of a hit. Whether or not it's worth repairing is up to you.