My video doesn't do anything no lights no sound what happen

I had my camera over a year or so, i have about 3. Just the other day i looked on my iphone, i seen that my camera wasn’t working. I took a look at it, didn’t get a light. Tried to reset, didn’t get anything. I took out my sd card, tried to look to see if it was full, or it I could read anything. My computer won’t recognize the sd card. I hope my camera didn’t burn up. I recently bought a usb power strip, i plugged the usb directly into the strip. I hope this didn’t fry my camera any help. Thank you. My other three work, but i use the plug that came with the camera. I hope I didn’t mess this camera up. Its the Chinese version.