1976 Cb750 completely dead

Hey guys so here's the scoop. I was riding and hit some water and fell. Not hard and I wasn't going too fat and was able to take most the impact with the exception of the pedal and side of the grip. But today it won't start and no lights nothing. Checked the fuses it isn't that. And ideas scholars?

did you check your battery?

I have a yamaha xs 650 i ran into a problem once all the lights went. it ended up being a severed cable to the battery. right underneath the seat