My mustang wont start

This morning I was driving to work, my Mustang is
my daily driver. My music was on and all is running
fine but then I stopped at an intersection and the
power surged with all the electronics turning off
and on quickly. I continue to drive to work and
when I got out until open my trunk I had to hit the
button twice to open it, I figured it was just ran out
of batteries, but then when I went to lock the door
it wouldn't work. Thinking the remote was dead I
just went to lock the door with the button for on the
inside but I had no response. I then hopped in the
car and to turn the key to knows only two buttons
were flashing. If I remember correctly it was the
airbag and another one I can't remember. I let it
charge rest of the day only two knows no result. So
I bought a new battery and installed it with the
same response. I turn the key and there's no
reaction. I've checked a few fuses but haven't
found anything wrong. Any suggestions would be
helpful. Thanks