If your blowing produces no sound, check your bottom lip to make sure you're not unconsciously pulling it up. Rotate the flute to change the angle at which your breath hits the blowing edge. Also, trying varying the shape and pressure of your blowing, and how far your bottom lip extends over the hole.
What is wrong with my flute?
Look for fraying, peeling, puffing, or tears in the “skin” of the pads. If you see any of these, your flute can limp along for a while, but probably needs repair depending on the severity of the tears. Some bubbling or dirtiness is possibly okay.