I can't connect to a projector or large screen, the icon is gone from the upper margin

when i tried to connect to a projector at a business meeting nothing happened, as if the adpater was not connected. We restarded the computer twice and noticed that the little screen that normally appears in the upper bar is no longer there and no matter what we do, nothing.
what is missing or what i am doing incorreclty?

I am hear at the New York Public Library now. I am connected to the internet on their WiFi but still cannot get to their site at the address http://www.nypl.org , it times out. I pinged them with this result:
Ping has started ...
ping: cannot resolve http://www.nypl.org: Unknown host
I tried "lookup" with the following result:
Lookup has started ...
; <<>> DiG 9.4.3-P1 <<>> http://www.nypl.org +multiline +nocomments +nocmd +noquestion +nostats +search
;; global options: printcmd
nypl.org. 182 IN SOA ns1.nypl.org. root.ns1.nypl.org. (
2002092709 ; serial
10800 ; refresh (3 hours)
3600 ; retry (1 hour)
10800 ; expire (3 hours)
10800 ; minimum (3 hours)
I have tried at other times to get to the site through links from other sites with no luck.
Thank you in advance for your time and attention.

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I can't connect to a projector or large screen, the icon is gone from the upper margin

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