Troubleshooting

My car won't start. I had a test done and it was determined that I need to replace the head gasket. I drove the car last night and it started to overheat once, but I pulled over and turned the car off. None of my fluids are mixing, I did have the white smoke coming from the tailpipe, and now it won't start at all today.

I want to know if the car will start again? It seems as if it wants to start but won't turn all the way over. Thanks!