DREAM MULTIMEDIA DreamBox 500 Manual For Correct Setup page 7

11. Watch TV.
Error Messages:
If the screen says 'Service not Found' then you need to
correct your setup of satellites in Satellite Configuation, FTP
a new Service/Channel list to the DreamBox, replace your
switches, or check your wiring.
If the screen is black without messages then you have an
emu problem and need to check where you FTP'ed the "Key"
files and/or reboot.