OK fill the tank and only use water press the small cap botton and after 5 seconds stop the machein and do the same again untill the pump gets the water into the system
Question edited for typos and spelling. It is a 'frother' rather than a 'throther'.The roaring is normal, you are releasing steam from a boiler. Steam wand issues are usually caused by cooked milk solids inside the wand. You need a good enzyme cleaner like Rinza. Help and videos in the linkhttps://www.google.com/search?q=Krups+EA+80+milk+frother+not+working+properly..
Dim displays are normally caused by failing, bulging or split capacitors on the back of the display. They regulate voltage to the display. If you are proficient with a soldering iron, you can do it yourself.
https://www.google.com/search?q=Krups+Pro+KM7000+dim+display
..