I've been using this same rig for years now and it's never failed on me. This morning when I woke up my computer was off (I usually leave it on over night) and it won't turn on! The link at the bottom of this post (it's a facebook video since I recorded it with my phone), shows what's going on. The computer will not do anything if I press the power. But if I remove the power cable, plug it in, and then try again; it will make an ever so slight move and then turn off again. I've tested the power supply using a paper clip and it appears that it's in working order. This has never happened to me and I'm not sure what's going on.
https://scontent-a-lga.xx.fbcdn.net/hvideo-xpa1/v/t43.1792-2/10565357_10204634993738559_27105630_n.mp4?oh=3655dbe171254d69408367f933e946a3&oe=54035A8D
https://scontent-a-lga.xx.fbcdn.net/hvideo-xpa1/v/t43.1792-2/10565357_10204634993738559_27105630_n.mp4?oh=3655dbe171254d69408367f933e946a3&oe=54035A8D