That is a known problem area as HDMI can have HDCP which creates issues when converting to non-secure connections. ONLY THE PRODUCT MAKER CAN FIX THIS! And in most countries it's illegal to strip HDCP in such a device. Weird but that's how the laws are today.
I hooked my Roku up an old computer monitor using an VGA to HDMI adapter picture shows fine Netflix comes on but after I press play the screen turns blue and only the captioning shows but when I shuffle from scene to scene I see the little thumb nails but the big screen is blue can anyone help me