This happened to me when I flashed SlimKat 7.6. I all I remember is that it got insanely hot, and didn't turn on until the phone cooled down completely. If this not your only phone, i'd replace the battery, and while you are replacing the battery check if there is any signs of damage from the heat. If it is your only phone, I would just keep a cable with me at all times.
Some useful links
How to disassemble the phone: youtube. com/watch?v=G0dKEaIEqYY