What does the error message "computer cannot connect to the server" mean?

It may mean that you have a problem with your internet connection. ORCA requires an internet connection. 

Make sure your computer is connected to the internet, and consider checking that an office firewall or similar program could be blocking ORCA connecting to the PDC database. 

Try clicking on File on the upper left, then Utilities, then Reconnect to PDC. If this doesn’t solve the problem, contact PDC staff for help.