One unit does not turn on when plug into power sources. What to do?

Hello, I have a problem with connecting to the router, which might not even be caused by the router itself. I use the TL-WR940N router in my home network. Recently I have been unable to connect to the

5g wifi broadcast does not appear.

I cant log in to the site

It seems that my router is not on the list. IT IS AC1750 ( THE NAME ON THE BOX) Behind My NAS 326 there is a flashing LED light and that is flashing orange and NOT GREEN , meaning there is no connecti

I have done something wrong with my password. I do not manage to reset password from my mobile phone as I onlgy get up a page saying "not connecting". No problems with signals. Can look as if I have m