iPad freezes and won't turn back on I'm having troubles with my iPad. While using my iPad it suddenly froze and later it shut off altogether even though the battery was 90% charged.

When restarting I looked at the screen and there was a small loading icon but no Apple logo. The loading screen just kept going and the iPad won't turn on. 

The catch is, I can't use my restart button because the button is broken. This iPad is also old (probably an iPad 2).

What can I do to try and get it to restart?
If you iPad is currently spinning trying to boot and you don’t have access to the power button there isn’t much you can do at the moment. Hopefully allowing you Device to continue to try to boot will drain the batteries. This will allow your device to shut down, then start charging and hopefully it will boot up. Start charging with your computer so you can tell if your computer is recognizing the device while it’s booting. Going to About my Mac > System Profile > USB will show you if your device is registering with your computer. 

If not, and you are comfortable following an ifixit tear down, you could take it apart to see if you can either clean up the power button (it’s probably dirty) or manually press the power-button if the little lever is broken on the button, which you could use for DFU or Recovery. 

Search for your models water sensors, usually in the headphone and charging jack to see if there is water damage.