My controller stopped working without any fall or strain.

I'm having a problem with my PS3 controller. I was playing GTA V when the screen suddenly went black, so I turned off my PS3 by pressing and holding the power button for about 10 seconds. After that, I turned the console back on, and it worked perfectly and went to the main menu without any problems. However, the controller has completely stopped working. Even though it was charged beforehand, it's completely unresponsive. I tried connecting it to the console via USB cable, but it didn't work. I also tried connecting it to the charger, but there's no charging light or any indicator light. When I press the PS button, no light comes on at all, and there's no flashing or response. It seems like the problem is with the controller itself, not the PS3 console. What are the possible causes of this malfunction? Are there any diagnostic or repair steps I can try?