Hi Jorge.
Thanks for posting on the forum.
The projector requires the remote to power on and has no buttons on the projector itself.
If you have still misplaced your remote, you can purchase a replacement remote by contacting a Promethean Reseller.
A full list of Promethean Resellers can be found on the below link: www.prometheanworld.com/.../how-to-buy
I hope this information helps.
Adam
Promethean Technical Support
(Case 00427691)