Pull the springs out on the battery cassette and try again
They sometimes “set” and take a memory too compressed and despite fresh batteries the unit won’t power up.
Just firmly pull the spring to make for greater tension
Hope that helps
Excellent advice. Also, look in the bag the scope came in and there is a spare AA battery holder. Swap it with the current battery holder and try that. If that still doesn't work, plug in a USB external battery pack to it and see if it will power on. If you're still getting nothing.....it's dead.
I understand the frustration but the Photon RT has been out of production for 1.5+ years now and if you had one under warranty Sightmark would replace it with the new current production Wraith HD.
Again, I know it's frustrating but it's hard to blame Sightmark since I don't know of any electronic company (and that's what this is, an electronic item) that would replace a defective $550 item that has been out of production for 1.5+ with a brand model, for a second hand owner with no receipt. I've seen Sightmark go way above and beyond to help people before but there eventually comes a limit to what they can reasonably do. I know that might sound harsh but when you think about it from a business standpoint, it's really only logical.
I would definitely try all those battery options I mentioned above. I've seen very very few Photon RT's that just "died". I'm really think it's a power issue.