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Answers (3)
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This could be caused by any of the following:
The projector is turned off.
Your computer isn't connected to the network.
The projector isn't connected to the network.
One or more network-related problems are preventing your computer from connecting to the projector. For example, a router or Domain Name System (DNS) server might be down.
A firewall could be blocking the outbound connection on the projecting machine.
One or more services required for network projection might have been turned off by Group Policy.
The projector is connected to a different network than your computer. You may need to ask your network administrator for permission to access the network that the projector is connected to.
The projector might not be configured to accept ad hoc network connections, even if the projector is connected to a wireless access point. You may need to ask your network administrator for credentials to connect to the network that the computer is connected to, or ask the network administrator to configure the projector to accept ad hoc network connections.
http://windows.microsoft.com/en-IN/windows-vista/Network-projectors-frequently-asked-questions
