NEC NP4001/NP4000 - Manual (Page 44)

2. Installation and Connections
32
2. Turn on the projector and select the chosen method of connection from the
source menu before turning on the PC (see o Selecting a Source on page 39 ).
3. Turn on the PC.
Note:
Failure to follow the above steps may not activate the digital output of the graphics
card resulting in no picture being displayed. Should this happen, restart your PC.