Power surge while iPhone was charging, now it won't turn on?

We had a power surge during the snow storm while my iPhone 4S was plugged into its wall charger, at about 50% charged. Now the phone will not turn on, will not hard reset (holding home and power) and will not restore (holding down home key then plugging it into the computer). Could the surge have caused this or is there some other issue?

I think it's appropriate to mention that about 2 months ago it got a little wet, but I did the rice thing and it's never caused problems. It can't have been because of that, could it? I'm still under warranty (not AppleCare+), but with the phone jack water damage thing being pink, I'm not sure they'll do anything. Does the damage color thing record when it happened so they will know I'm not just trying to gyp them into doing a free repair?

I would remove the battery