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How old is your machine ? and what maintenance have you done over time such as replacing the shower curtain located at the pourring end of the hot water ? I had too very loud noise coming occasionnally from the stainless steel rack holding the cup while coffee is delivered. If your ground coffee is too fine it will stop flow during making a shot. Is water coming out when no coffee is placed in the portafilter.The water pump on this machine is a cheap pump that has to be replaced over time. Mine is 7 years old and has delivered four cups of expresso everyday of the year, and still working.
It may be that the 'shower screen' which is a perforated metal disk filter that fits inside the head has reached its use by date.
These can be found and bought on E-bay for about $15 each, make sure you buy a genuine Rancilio replacement, while you are at it, replace the rubber 'group seal' - a rubber ring for pressure sealing the head/arm after filling the arm with grounds - these are a similar price. If you get leaks around the head while making a coffee, the seal is worn out.
The loud buzzing is the water pump, sometimes they are loud on the beginning, And the reason is there is no water in the pump. It should get better. These small espresso machines have a vibration pump (this is the official name), And the name says it all.
The pump is a vibratory pump on rubber mounts. It makes a loud buzz when running.
The pump makes a knocking sound when it is out of place on the mounts and banging into something and when the pressure is high (water flow is blocked)
Open the wand all the way (no back pressure) and make some hot water. If the noise changes to a quiet hum, get a warranty repair. If the noise changes some but is still a knock, take out the water reservoir and the pump shield.
You can see the shield by looking down into the cavity left by the reservoir. One screw hold the shield in place. Remove the screw and the shield, and wiggle the pump around in its mounts until it does not bump into anything when running. Then replace the shield, screw and reservoir.