MacBook Air Will Not Restart Yesterday, my 2013 MacBook Air powered down unexpectedly, and since then I have not been able to restart it. It appears to be cycling through restart and shutdown every 5 seconds. I can feel that the case is heating up and the fans turn on but then they shut off and the cycle restarts. The screen remains blank, and there are no start up bells.

I have tried the various shortcuts I have found on Google to restart my Mac, but none have worked. What should I do next?
It was a problem on the motherboard. I had to take it to apple and they changed it.