PLEASE NOTE! If you have gone through all of the above, like "I" did, and still get the Orange icon, and, when you test Port 80 you get "Apache", look at the file: c:/wamp/bin/apache/apache2.4.9/conf/httpd.conf (your apache version number may differ).
In the file, about line # 62, you'll find a note saying to fill in this:
Listen 0.0.0.0:80 Listen [::0]:80
Why?
Change this to Listen on specific IP addresses as shown below to prevent Apache from glomming onto all bound IP addresses.
I changed that to match my localhost IP address and when I restarted Wamp, it quickly went from Red to Green. Success!...3 hours later....