Kenwood KDW 1274w - no error code, no pump?

Hi,

I am trying to fix our Kenwood KDW 1274w washing up machine. First I had an E4 error message. I had took the machine apart, and i found a pipe not connected. I fixed it and put the machine together again. While I was fixing it, the machine was laying on its side...
I started it again and I do not have the E4 message anymore, BUT...
The pump is not running. The time counts back on the display, no error message, the machine filled itself up with water, but nothing going on. Only a big silence.
There was no problem with the pump before.
Do you have any idea what to check?

Thanks very much

Balazs