Last night the computer worked fine. It has always worked fine. I shut it down last night. This morning it won't turn on. Nothing has changed. I looked inside and there is no LED light on. Did the PSU die suddenly? Specs: i5 ivy bridge 3450 Nvidia GTX 560 ti 448 8gb ddr3 ram. 2tb 7200 RPm HD 120GB SSD 400 watt PCPower MKIII PSU. Yes, 400 watt seems low, but it had never given any problems in the past like 6 months. Also, it was recommended here as superior to many 500 watt models, and all of the PSU calculators I saw say my average power draw should be 320 watts and max 384 -- within range. Any other advice? What could have happened? there's no smell, nothing.