More often than not, this is caused by 'Aero Mode' in Windows. If working on Windows, ensure that you have 'Aero Mode' turned on. If that doesn't work, try right-clicking on DisplayNote and running as admin. If still not connecting ensure that bonjour is working.
What is Bonjour?
Bonjour is Apple's implementation of Zero-configuration networking (Zeroconf), a group of technologies that includes service discovery, address assignment, and hostname resolution. Bonjour locates devices such as printers, other computers, and the services that those devices offer on a local network using multicast Domain Name System (mDNS) service records.