My camera isn't turning on

A week ago I was able to put a 2CR5 battery into my camera and use it perfectly, LCD was also working, lens was also able to pull power to change focus. All of a sudden for the past few days it's not turning on. I've put two different batteries in nothing is turning on, no response even on the LCD panel nor on the lens ring. Is there any advice I could get? Is there any way to troubleshoot and repair it or send it for servicing somewhere? I live in India btw.