I had a 580watt Hiper PSU for about the same time as yours (13 months) , then my PC started to reboot or didn't want to start up . After a short time like this, the PC wouldn't boot up and it turned out to be the Hiper was faulty . I chose not to RMA it and put it in a skip because I had no intentions of fitting another one since there were quite a few going wrong. I was just glad it didn't take out any of my other components.
