First, check that the projector is switched on and has been allowed to warm up (about 30 seconds).
You will need to select the correct source on the AV control panel, it may be worth pressing the laptop button then reselecting the DVD button. Please refer to the room’s instructions on how to do this.
If you are trying to play a DVD via the PC, you may need to check that it is the correct region for the UK (Region 2). If it is Region 1, you can try using the standalone player instead.
See also
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This is question number 1396, which appears in the following categories: