I was working on my new RPi 2 Model B yesterday when it shut off mid-use and wouldn't turn back on. I was in the middle of testing a project with a breadboard and believe that I mixed a wire or otherwise crossed a 5v connection with another connection.
I'm not sure exactly what happened, or even how it might have happened, but it no longer shows any lights when power is connected and appears to have the correct voltage coming into and even after the polyfuse. I've also tested other power supplies, just to make sure.
I gave it a few hours before attempting to power it on, but it didn't show any lights. The SOC does get hot, which may be a bad sign.
Is it dead or should I give it a few days for the polyfuse and see what happens?
If it is dead, is there anything I can do in the future to prevent this (besides being more careful)? This is my first foray into RPi and I don't want to keep running into the same issue.