No HDMI Signal Every Time Sky Box is Switched On

[Simonb73]

What we found was it just takes a long time to start up. I had this issue and changed Sky Q box twice. 

When I  switch on now it can take a good 30 seconds to get everything working (Sky and soundbar) but it does come on eventually. 

[Omicron]

I have tried patience but with no luck.