I bought a Xbox one S last week came with digital copy of Rare replay. I have slow internet so it took 2 days to download. I go and launch it, shows launch picture, goes to black and back to the screen I was on when launch. I put in a disk game Halo 5, it disk installs and I go launch it same thing. If I send the system back and get a new one will it fix it?

There is no error messages. I can't find this problem on Xbox site and asked Xbox support on twitter they just link me to disk error page which was no help. Googling it I get old post saying multiple things from DRM to over heating.

Maybe?

I'd say first hold down the power button for like ten seconds or however long it takes for it to switch completely off, then power it back up and try again. Sometimes that fixes my similar issues. But yeah, if that doesn't work, I'd say perhaps send it back. That's strange.

Did that didn't work. guess ill return it and hope its the system

I had this exact issue with a digital copy of Dark Souls 3 recently. I uninstalled it, redownloaded it, and then it worked.