Having this same issue with no signal, trying to find this needle in a haystack button everyone is talking about - here are the pics in the back cabinet so we can search for this button - note all fans are running
0FA4565A-0107-498E-BD9E-E042902AACB2 (resized).jpeg186604E5-5625-4EB6-A265-4CB14474B9BA (resized).jpegBBD60A14-5F99-4AC4-94F0-7C8ED93EF0D4 (resized).jpeg