I helped my father to fix two of these machines that had this problem. He never uses the steam, only making crema coffee all day long, every day.
It is not easy to fix, but its not complicated either. If there is no water flow from the brew group, but still steam, that means the brew group has gotten clogged with Calcium.
When you take it apart you will be amazed.
You will need a very short and fat Philips head screw driver.
or similar. Any hardware store will have it. 1st step is to turn the machine on its side on a soft surface to protect from scratches.
Remove the brew head and look in the brew group where you prob. haven't looked before. You will see a screen with a Phillips head screw in the middle. You need the screw driver to remove that screw. It is like almost melted in from the high heat so you need a Phillips with a fat head so as to not strip it, and a thick handle to apply a lot of torque. And you will need a bit of strength.
If you make it past this just hit me back and I'll tell you more. Or hit me if you have any other questions about this step, or at all. Believe it or not, there is more stuff past the screen.