I am confused with your #1 point like you are being poetic. I understand that the solution is based on the problem but if you will start with the problem then that means you have no solution yet. The start up cannot be started, right? And who is in his right mind that would start a business when there is no solution to the problem yet? One example is capital. The problem is the lack of capital. Of course, you cannot start your business if there is no solution to your problem yet.