Two non Sky TVs have lost signal

[Nerys5379]

I moved some furniture earlier, doing some cleaning, including the Sky box.  Nothing seems to be set up any differently now and all existing connections seem secure, but my two non Sky tvs now have no signal and have the message 'check the antenna'.  The Sky TVs works fine.   

there is one white cable which one end doesn't connect to anything, but didn't before the problem started.  

I've made sure everything else is secure. 

I've photographed the back of the Sky box and other small box that came with it.  Any suggestions of how I can fix?   My moving around must have done something. 

[Daniel0210]

@Nerys5379 
A message displaying ”no signal” tends to be generated from your TV and normally means your TV’s not seeing the Sky box on the relevant HDMI input.

[nigea99]

hi @Nerys5379 

Check Antenna messages usually refer to Terrestrial 'Freeview' TV  

SKY Q does not have any RF connectors used for Freeview and the images you show do not seem to be used for that

Do you have a communal system  ?