We Have A Freeview Box And Flat Screen Tv. When We Turned It On This Morning It States ‘no Signal’?

I’ve unplugged everything, plugged it back in. It still doesnt seem to be working.
I’m thinking it is the aerial. Could it be the freeview box?
We live in east London

How Do I Get Surround Sound Connected To My Flat Screen Tv And Xbox360 Correctly?

I have a Hd Flatscreeen tv with freeview built in works perfect then my xbox connects to my tv via hd cables to the pr pb y etc works perfect… i have just bought a Philips home theartre system connected it up like says in manuel and when i play a dvd it sounds awsome. but cant get my tv/xbox through the surround speakers. i have a hdmi cable running from my dvd/home theartre system into my tv. speakers are all connected as the dvd works perfect. then someone said connect red and white wires from tv to the dvd/home thearte system . done this and i still cant get xbox to work but then i tested the tv and i was watching a freeview channel and sound was coming out the tv as per normal turned on the surround sound and itv1 started playing through surround sound . the guy at currys says all i needed was hdmi lead and all would work but it does not please help…. have i connected wrong ? i know i do not have a optical connection on home theatre system but i just want sound ?