Too little detail. What model is your Roku? A TV or player box? Do you see anything at all when the Roku is booting? More questions to ask once we know what Roku you have.
Dan
Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.