Hello, I don't know my issue was by motherboard or power supply or something else. So, I hope I am OK to post in here. 
my PC, most of parts are EVGA parts, suddenly have boot up issue. Here is what I did
1. I added internal HDD. connected to cables.
2. I removed two of my rams from motherboard. (to install those into my other machine, but still have 4 rams on the motherboard)
3. To remove rams, I had to remove/install my graphic board from the motherboard.
4. I turned on the power, motherboard/fans runs only for 5-10 seconds, then shut off/ The PC keep trying to boot up, but it keeps happening.
To remove/install HDDs/RAMs, I don't think I did anything bad, I didn't hear any sounds made me worry.
I also unplugged the new HDDs and also removed Graphic card, but still have the issue
Can you advice what I should do?
 
Motherboard Model :EVGA X99 Classified, 151-HE-E999-KR, LGA 2011v3
Graphics Card Model :EVGA GeForce GTX 980 Ti 06G-P4-4995-KR 6GB
CPU :Intel Core i7-5820K Haswell-E
Memory Model :
G.SKILL Ripjaws 4 Series 32GB (4 x 8GB) 288-Pin DD
Removed Rams
G.SKILL Ripjaws 4 Series 64GB (2 x 32GB) 288-Pin DD
Number of Memory Modules * 6 to 4
Power Supply :EVGA supernova 1300 G2

oh, sorry to post in wrong spot, where I should had posted? 
Anyway, one update.
It's so weird, I re-installed the two rams I removed. Then, seems lie running/
i tested without the graphic board, so, it's not perfect test, but the PC and its fan keep running
I hear some people have similar issue after install rams, but revmoving rams cause any issues?
by the way, the ram I was trying to take off, they were added rams. my first boot when i bought, it was working without the added rams

>I would pull the BIOS battery out for 1-2 hours and try with the 8GB modules only
I am sorry, i am not familiar with BiOS, that mean, unplug the machine from outlet, leave for 1-2 hours, and try to restart with only 32GB (4 x 8GB)?

thanks! will try

macgyver190
oh, sorry to post in wrong spot, where I should had posted? 
Anyway, one update.
It's so weird, I re-installed the two rams I removed. Then, seems lie running/
i tested without the graphic board, so, it's not perfect test, but the PC and its fan keep running
I hear some people have similar issue after install rams, but revmoving rams cause any issues?
by the way, the ram I was trying to take off, they were added rams. my first boot when i bought, it was working without the added rams

Normally in All other EVGA motherboards or hardware. Seems RainStryke is probably right on it on RAM size supported, it's been a long time since I have used that platform and some others x99 was most of my workstation machines at my company and at time of purchase made sure everything was compatible for the workstations, Then no upgrades for a long time.

X99 Chipset Motherboards

• Support Manual for EVGA X99 Classified (151-HE-E999) - Part 1 Part 2 - BIOS Guide

 
 
 
1) Look at the LED Status Indicator ... What Code does it stop on? (page 12, Part 2 manual)

2) It is required to populate an odd slot (1, 3, 5, 7) first. The board will not boot if only even slots (2, 4, 6, 8) are populated.  (page 13, Part 1 manual)

RainStryke
In the bottom right corner of the motherboard, it has a CR2032 type battery in it. Pluck it out of the motherboard for a bit and reinstall it after an hour or so. It's also possible you might need to replace it. 

I think it's always a good idea when you pull the battery to replace it with a new one. It never hurts and is way better to replace it then find a time when it's died but then again the system is probably several years old before it dies so it's like a one time replacement if that.