I have a Nano Ledger S Wallet that hasn't been used for a long time, but after plugging it into a PC/laptop, the Nano screen doesn't display properly, there are even "dots" whether it's damage to the display or other error problems.
This is very common issue for many owners of Ledger model S hardware wallet, especially if it was not use for a long time.
Some people report dim screen, other have dots or other errors like missing lines on screen, that makes wallet unusable.
First thing you can try is to use your smartphone camera mode and see if screen characters are visible through phone screen.
If this is not working than you have to buy new screen that is very cheap, or buy new hardware wallet (Model S in discontinued).
Has anyone experienced anything like this?
I did not, but I saw many reports on reddit and social media.
You can read one topic I wrote about Leger model S and find links for new display:
https://bitcointalksearch.org/topic/why-i-wouldnt-buy-ledger-nano-s-ever-again-5370521