ipad 7th gen still wont restore, 5 different cables 3 different pc's, what is going on

Hello ~It seems you have tried unsuccessfully to restore your iPad …sorry you are having this problem as well. I am going to post another article to read and how to make a Genius Bar appointment as that may be your next step.

Genius Bar Reservation and Apple Support Options

Restore your iPhone, iPad, or iPod to factory settings - Apple ...

Restore your iPhone, iPad, or iPod touch from a backup

~Katana-San~

You need to search online for your nearest, “local” Apple store location and call contact phone numbers and call to make an appointment to have your Apple iPad diagnosed and options presented you.

Failing that,

You need to contact Apple support via the contact support link located at the upper right hand corner of every Webpage of these Apple support communities.

Use the Hardware Repair & Battery usage & Charging support categories.

OR

by installing and using the Apple Support app found in the iOS App Store.

Tap the iOS App Store link below.

https://apps.apple.com/us/app/apple-support/id1130498044

OR

Call contact Apple via the support numbers found in the link bekow.

Contact - How to Contact Us - Apple

Tap the link below.

https://www.apple.com/contact/

Best of Luck to You!