Please provide some information about the hard- and software used.

Box type:dm600s
GUI (enigma1/enigma2):enigma1
Firmware version:

Trying not to break it !!! The dm600s was always working perfect until I decided to put a dm800 in its place. After one week I decided to install it again and now the tuner doesn't get any signal from both satellites (Astra % Hotbird)

I took the dm600 in another apartment of the house which takes signal from the same dish and cable, and it works fine. I then reinstalled dm800 and there is no problem. To sum up, I've tried the dm600 and it's not working in one place exactly even if I tried it to 3 other houses and it works fine. In the same place where the dm600 doesn't work, every other receiver I tried works fine.

Is there any logical explanation for this ?