Troubleshooting Kindle Power Button & Keyboard Unresonsive

[mrfakename]

Hi everyone,
A while back, I got a used Kindle Paperwhite 3G (Keyboard). I ran into a couple issues initially but got it working pretty well. I've been using it pretty frequently (almost every day), however recently when I tried to turn it on nothing happened. I tried charging it for 24 hours, holding the power switch for 20, 40, and 60 seconds, but nothing worked.
The strange thing is that the power button and the keyboard both seem to be unresponsive. Normally, when I press the power button, a green light appears, however now when I press it the green light does not turn on. However, when I charge it, the light turns orange (expected).
I opened up the Kindle and didn't notice anything strange so I closed it and charged it overnight. The Kindle restarted and opened to the password screen. However, when I tried entering the password, the keyboard didn't work (nothing changed on the screen).
So now I'm pretty sure my power button and keyboard are broken, any suggestions on how to fix it?
Thanks!