Problem with Siemens Surpresso Compact tk58001

Hello, I've been working on my machine for two days now and can't go on any further. At first the brewing group was stuck, which I fixed with a 9V battery. After I have put everything together again, the Ecotaste and the steam button flash alternately. Nothing more happens when you switch it on, no noises, just nothing. Does anyone have an idea???
Greeting Arno
Update: Machine is running again. Unfortunately, the coffee flows directly into the drip tray instead of into the cup.

Examine the brewing unit for cracks if there is really coffee in the water bowl.

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Thanks, but that doesn't seem to be the problem. Greeting Arno