My computer died

Yesterday I was using my computer and it just died. All the lights went out. No sounds. It was dead. Several times during the day, I tried to turn it on but it was totally unresponsive. I checked my power cord, eventhough I had recently checked and had battery just before it died and it was plugged in. I checked the plugs. It was plugged in the outlet and plugged into the computer. I was a bit bummed out yesterday, but my computer has been acting up so it was not unexpected. Then this morning I was sitting here and noticed the power cord was plugged in on both ends but it was disconnected in the middle. I got everything plugged in and my computer was happy again and I was relieved.