The tv SCART can output in RGB whilst the video one cannot.
Some info here
http://www.ricability-digitaltv.org....-smt-2110c.htm
assuming it's this model you have. If not you'll find others around there too.
I only switch my cable modem off if I have to reboot in the event of problems and only sometimes place my STBs (V+ and Pace) into standby, although rarely.
HTH
Cheers