The problem occurred again. I was adding a BD Drive, a 3.5 HDD loading drive, and relocating the case fans to the motherboard from the Case. I was thinking maybe I was imagining it with the case not booting up on start. When I turned it on, the computer was on for 1-2 seconds, then the lights, fans, everything turned off (front fans have LED's), then after a 2-3 second period, it would turn back on and boot normally. I have not encountered this problem yet after just shutting the computer down and turning it back on - it seems to occur when I work on it (when I cut the power).
Another funny thing I have noticed is that when I do shutdown, I do hear a fan inside the computer still spinning at a very high RPM. The case fans were not running, and I do not believe it was the Noctua, which from elimination leaves it to be the little 80mm Armor fan.
Maybe it is the PSU, Motherboard?
Just so everyone knows the setup
CPU: 5820k (http://www.amazon.com/Intel-i7-5820K-Haswell-E-Processor-BX80648I75820K/dp/B00MMLXIKY/ref=sr_1_1?s=pc&ie=UTF8&qid=1448946367&sr=1-1&keywords=i7+5820k)
CPU Cooler: Noctua NH-D15 (http://www.amazon.com/gp/product/B00L7UZMAK?psc=1&redirect=true&ref_=oh_aui_detailpage_o09_s00
Motherboard: x99 Sabertooth Asus (http://www.amazon.com/gp/product/B00VUK54F0?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s01)
PSU: EVGA SuperNova 850 Platinum (http://www.amazon.com/gp/product/B010HWDOH6?psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s00)
Memory: Mushking Redline Enhanced (http://www.amazon.com/gp/product/B00T0ZK5DI?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00)
GFX: EVGA 560 GTX ti (Used, my old one)
HDD: Samsung Pro M.2 256GB (http://www.amazon.com/Samsung-950-256GB-PCIe-NVMe/dp/B01639696U/ref=sr_1_2?s=pc&ie=UTF8&qid=1448946487&sr=1-2&keywords=Samsung+m.2+pro)
Case: Corsair 760t
The computer otherwise appears to be working just fine for the most part. However, I would like to run some diagnostic tests to see if everything else is running fine - any recommendations? Should I be concerned by this micro power on - off - on initial boot?