I just replaced my old i5-6500 CPU with the i7-8086K that I won from the 8086 sweepstakes, and now my PC won't boot. Most of the time, the trim lights on the motherboard light up for about a half second and the fans spin up feebly, but then everything shuts back off. About every 10 tries, the lights and fans stay on but there's no video signal. If I plug in my GTX-1060, its fan jiggles every 5 seconds until I turn the PC off. My PSU is 620W so it should be plenty powerful for the new i7, but it's not working. My motherboard is a Gigabyte GA-Z170-HD3 which is on the list of supported motherboards for the i7-8086K that I found. What else can I try? I suspect my PSU may be on the fritz as I have previously had issues with random system freezes, but it hasn't happened in a while. Should I try a new PSU or is something else awry?