Facing TV Problems? Ask a TV Technician.
Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
If you get a black screen when you attempt to launch Netflix, there may be a problem with your Roku.
Unplug the Roku from power for at least 1 minute. While the device is unplugged, press the power button on the device to discharge it.
Then try turning it on again.
Let me know if that works?