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I have an AX850 PSU that I got in 2012. Over the past few days my PC wouldn't turn on, so I fiddled around with the lead and it worked. Today however, it didn't work and my machine wouldn't turn on at all, I am only running a stock 3930k with 16GB memory and an old HD 4870 with an SDD and one HDD. I have tried a different lead, removing and replacing the cables and I have tried jump starting it, nothing happens when I plug it back in. This is one of the most reliable PSUs on the market, so is the PSU dead and if so what do I need to do?