Is the water coming out of the spout or is it leaking from elsewhere?
If theres coffee in the basket and your getting clear water coming out then obviously the water is not passing through the basket. Sounds like a broken group seal which is usually less than $10 to replace and doesnt require an expert to fit.
For an average domestic coffee machine youd want to replace the group seal around every 12 months. I always like to keep a spare on hand.