Loud Pop from inside my pc?

So i was sat there playing on xbox with my PC on and suddenly there was a loud pop which sounded like it came from the PC. The pc never turned off or anything but i give it a quick look through the pane on the side and i see that my GPU fans arnt spinning so i go to msi afterburner put that fan speed up to see if... show more So i was sat there playing on xbox with my PC on and suddenly there was a loud pop which sounded like it came from the PC. The pc never turned off or anything but i give it a quick look through the pane on the side and i see that my GPU fans arnt spinning so i go to msi afterburner put that fan speed up to see if they will start spinning and they do. i still have a signal and everything still works fine. what could the pop have been and should i stop using my pc?
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