Xbox One won't connect to t.v.

Hi there have you connected it to the right HDMI port on your xbox bear in mind there are 2 ports one to T.V and one from t.v hope this helps.

Use a scart cable for the old XBOX then use a composite converter to connect it to your T.V. if you need to. Your new T.V. should accept one of those old standards. Your T.V. should have a scart and composite dongle that will allow connectivity. It sounds
like you've already got a composite cable.

Make sure that the display settings are set-up for your T.V.s resolution. Your T.V may also need to switch to another setting for HDMI connected devices. My t.v has to be set to Movie or my Netflix won't play through my Xbox it also just gives me a black
screen until I change the setting.

Thank you.Still won't play on T.v.?It's a head ache

It depends on your T.V. but you won't suffer the same glare on a CRT T.V. that you would on LCD or LED so set your brightness high to make more of the game world you're playing in visible. It's all down to preference though and won't make much difference
if you're enjoying a game and can see what's going on. There are loads of variances on T.V's beyond what you mention.