Samsung S4 Unresponsive

A

AC Question

The past couple of weeks I've occasionally been getting the reminder from samsung on my phone that something might be wrong with my battery. I had another one, so I decided to pop the old battery out and try the new one, since a removable battery is one of the huge perks of Samsung.

Now it's completely unresponsive with EITHER battery. I tried leaving it over night--nothing. I tried plugging it into my computer--it doesn't recognize it. No charging light comes on. It should just turn on without being charged with the original battery because it was full, so the cord being broken are not shouldn't even matter--but nope.

I tried holding the power button for a very long time, and the power-home-volume down trick.

Please help!!