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Audio, but no video on my Roku Ultra 4640X

Hello,

I am having a great deal of difficulty getting my Roku Ultra to work properly.  My wifi is working fine, the menu displays, but all my apps only have audio, no video.  I have tried numerous fixes over the last three days, but nothing is helping. I have made sure the HDMI cable is properly connected, I am using the power plug provided with the unit when purchased, I went to home and hit reset.  I plugged and unplugged both the TV and the Roku.  I made sure the display was set to 1080 (older tv) and when it asks, "can you see the picture provided",I answer yes, but THAT didn't work either. What is left?  I  did not do a factory reset because I don't want to go to the trouble of reestablishing all my accounts.  Does this mean the unit has gone bad?  Any help is appreciated.

Mary

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