If your ViewSonic Projector can’t turn on, follow this guide to troubleshoot the issue.
If the remote control does not work, ensure there are no obstacles between the remote control and projector; and that they are within 8 m (26 ft) of each other.
The batteries may be out of power, please check and replace if necessary.
Read more:
How to Solve ViewSonic NH8 Projector Remote not Working?
How to Force Restart ViewSonic NH8 Projector?
ViewSonic NH8 Projector USB Usage Tips – Why USB Cable Won’t Work?