If the BenQ V7050i projector can’t turn on as usual, please check the following solutions.
Check whether the power is well connected. Plug the power cord into the AC power jack on the projector, and plug the power cord into the power outlet. If the power outlet has a switch, make sure that it is switched on.
Check whether the projector is overheating. Place the projector on a cool and ventilated place. You can try to turn the projector on again when it cools down. Check whether the BenQ V7050i projector is well connected to an external device.