Computer suddenly taking 11-12 minutes before booting normally

[EffeX1]

Yesterday, I was using my Chimera badboy running OSX 10.10.5 normally (Already working great for about 1,5 year). I shut it down and went to sleep. This morning I booted it up but my monitor light stayed orange, meaning it got no signal. My computer is clearly running (all lights, fan, keyboard and mouse turn on). At first I thought it was a GPU/Monitor problem, but when I forgot to turn it off, it suddenly booted normally after about 11 minutes. When I restart it does the same thing.

Specs:
Mobo: Gigabyte Z97X-UD5H
GPU: EVGA GeForce GTX 760 SC
CPU: Intel Core i7 4790K
Power: CoolerMaster V550 Semi-Modular
RAM: 4x 8gb Crucial Ballistix 1600mhz
HDD: Crucial MX100 256GB SSD (mac) and Seagate Expansion Desktop 2TB (Windows)

Also, yesterday there was a big thunderstorm here. Nothing impacted close or seemed to be different, but could it perhaps influence it somehow?

 

[P1LGRIM]

yesterday there was a big thunderstorm here. Nothing impacted close or seemed to be different, but could it perhaps influence it somehow?

Electrical storms can affect CMOS settings - Check your BIOS for changes.