In recent power surge and outage, the Seasonic SS-400ET power supply I had for about a year would not boot up. The power led on the motherboard blinked but nothing happened when I pushed the power button.
I knew Seasonic made reliable power supplies but dying over one power surge is unacceptable. Shipping it back for RMA would cost about the same as getting a new one, so I decided to open it up and fix it. I would suspect capacitor problems with cheaper power supplies but nonetheless I checked the capacitors. Low and behold, the standby power capacitor had bulged slightly. It appeared that the surge just stressed it enough to pop it.
Once it was replaced, it booted right up again.