I had a similar problem connecting my PC, when using the Neo box my TV could not see the PC connection at all. I saw others used a HDMI splitter. PC in two ports out, one goes directly to the TV, the other goes to the HDMI IN on the NEO box. The HDMI out on the NEO is not needed in this setup.

^ this solution also worked for me

I got the colour to sync , it was only a problem when playing YouTube on firestick or connecting my PC. I got this fixed now. Thanks for the support .

Faintly, they remain white the whole time

Do you have a test video I can try on my setup ? Are you saying the youtube video is too high quality ? How do I switch to SDR ?

Is this not a place to get support ?

This is the test video I used https://www.youtube.com/watch?v=8u4UzzJZAUg&t=39s