My computer has been operating without a hitch since May of 2017. All of a sudden though, after I had shut down my PC for the night, the following day, I go to turn on my PC, all the lights and fans start up for about 2 seconds and then everything goes dark. I check all my connections and hardware components and they all check out fine (except for the motherboard and cpu since I don't have other computers to check those from.). I watched as the computer goes through its first initial bootup, the CPU light turns on, then the DRAM, then the VGA, and then for a split second the CPU light, then it shuts down. Only light that stay illuminated is the Power LED on the front of the case. I cant wrap my mind around what went wrong. The only thing that changed with my PC was that it ran a few windows updates before it shut down for the night. Any help would be much appreciated. Thanks.