Lost home screen using x700 on a zd9 tv

[karingall]

After doing a factory reset on my zd9 I can to the setting of HDMI for the enhanced format when set the home screen going off and on and flickering

So checked were I had the HDMI lead on the TV, Which was in the HDMI 3 ARC slot so as I could have TV sound through my SDR-DN 1080, So I changed to HDMI 2 , Now when I switch on the TV and the X700 I now get a black screen and the words no signal detected , But when I put a 4K HD disc in the film starts great picture and sound 

What have I set wrong???

I bought a new set of HDMI cables to the highest spec last month

Why when using the HDMI 3  ARC slot you can not set to the enhanced format

Help please

[karingall]

To follow up tried the following from trouble shooting pressed stop then home and pop up this changed the output resolution and I get the home screen back however when I play a 4k disc I  only get 1080 60p so no 4k,

change the resolution back to 4k no home screen, Have to hope when disc is inserted it starts ok , picture is great no problems very stable , so what am I missing???

[karingall]

Update

With the player set at 4k resolution and the TV set to enhanced a Blu-Ray disc will not play you get sound but no picture, then tried a 4k ultra disc (Kong scull island) best picture and sound I have with this TV and player, still no home screen 

[karingall · Accepted solution]

Just to let you know problem solved, This with the help from the Sony centre Alloa who said its most likely your HDMI leads but I have just bought new ones from Amazon, so I bought 2 new leads plus a UBPX 800M2, Pixelgen are the leads now all works fine, The new player is just great