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Laptop to tv HDMI wont work

Not sure if this is the right place to post this. If not, I will move it. Heres my dilemna. I have an OLED tv . An LG 47LW5600. I also have a laptop. Its pretty contemporary and is running Win 10. I have both of these compliments of a fire in December. Both are running like new and I tried to connect them with HDMI so I can watch streaming movies. Im currently living rural and net here is real bad so I use mobile hotspot and dish for tv. The laptop detected the tv but theres a "no signal" message on the tv. Also, despite selecting duplicate and extend in graphics, I get no picture. Ive beat this thing to deaath trying to get help or find solutions. I cannot change refresh rates on either system. To me, thats where the problem lay. Its a mystery and nobody, including microsoft (no surprise) can find a solution. Thanks all.

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Clarification Request
did you...

In reply to: Laptop to tv HDMI wont work

...go into window's display settings and create a second screen for the TV connection?

All Answers

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Try the usual. A shiny new HDMI cable.

In reply to: Laptop to tv HDMI wont work

Or try a few of what you have.

Microsoft didn't make the cable, PC or TV so it's a stretch that they could fix this over the phone.

I'd try a new HDMI cable (one of those AmazonBasics) then have a service call to fix it.

Why are you changing refresh rates? Here, HDMI just works across the hundred W10 laptops I used last year (I travel and have set too many HDMI systems to run a PowerPoint.)

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