My coolpix7900 won't turn on...

I was at the beach with my friends and I DID NOT drop it in the water, the camera was on a minute earlier, i could see my pictures on it and then placed it in my backpack. A minute later, i'm checking my backpack, an orange light is on, NOT blinking, and the on/off green light is on. The orange light is right next to the flash. I tried to press the on/off button, even holding it down, but nothing happens. I let the camera sit for awhile, and the battery died. I charged the battery again and placed it in hoping it would fix, but the same thing happens. Please help me!