Question hdmi

Eikonikos Eikon

Distinguished
Aug 9, 2013
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Hi I have a 3 port hdmi switcher
3 PORT HDMI SWITCHER says "no signal"

You can see it here: https://www.amazon.com/Insten-SWITCHER-SPLITTER-SWITCH-Specification/dp/B0030AZ44O
It is 3 in 1
It has 3 inputs and one output.
Whenever I connect 2 or 3 inputs and select 1 of them, in output display says "No Signal".
The led lights show that the correct input is selected, but in output there is "no signal"
The first few days it worked fine but then it stopped sending a signal in output.
Why it does that? how can I fix this?
Thank you for your help