It seems to be DOA.
Here is my story
Windows 10 will not even detect it in Device Manager.  Even under "bios" I cannot get it to output any video signals (Both HDMI and display port).
I have placed the card into the same PCI-E slot as my 980Ti with the same power cables setup.  I can see the fan spin and the light turn on, but again no video signal output at all.  Currently I am getting Video  out through my MB built-in HDMI and has been doing trouble shooting for past 6+ hours.
So far I have tried the following without success:
1. Tried to uninstalled previous driver then installed official driver from EVGA site, which results in "This graphics driver could not find compatible graphic hardware"
2. Tried different power cable and pin and configurations with no improvement
3. Tried a different PIC-E slot with no improvement
4. Tried both HDMI and multiple Display port out with no improvement
5. Tried two different monitors with no improvement
6. Tried safe boot in windows 10 with no improvement
 
Now I am going to be back in waiting for RMA again...

I don't have another PC to test the card unfortunately.

No unfortunately, I will upgrade my BIOS and see what happens next

You may want to include your system specs too.  Some boards have options for changing how hardware is used which could cause this behavior.  Won't know without know what board is in your build.

I have updated by BIOS and retired everything still nothing.
Did I get a lemon or what's going on? Any suggestion?

OJS48
I have updated by BIOS and retired everything still nothing.
Did I get a lemon or what's going on? Any suggestion?

Could be possible, anything that's mass produced will certainly have a dud. To know for sure, the card would need to be tested in another system if any way possible. Like stated before, maybe a computer repair shop?!?

If can't a signal from either HDMI or Display Port, it's DoA. A driver isn't needed to get a signal, and if you were able to get a signal from your 980Ti, the problem isn't on your end. Unless you broke something, that is. 

According to PCpartpicker it supposed to be compatible. I would expect some warning or error message but the card acted as if it's not even there. Only fan and light no signal no error message from MB or device error in Win 10.
I suspect it was DOA when I couldn't even get any signal out of it.

It's Gigabyte GA-Z68XP-UD3. They have discontinued support for the MB so I don't know if they will response to my inquiry. It had no problem handling 980Ti.
A simple google search is not yielding anything.
Either way RMA is already in progress.

So one user reported the following system in http://www.userbenchmark.com
UserBenchmarks: Game 109%, Desk 85%, Work 58%
CPU: Intel Core i5-2500K - 91.2%
GPU: Nvidia GTX 1070 - 136.6%
SSD: Samsung 850 Evo 500GB - 83.1%
HDD: WD WD2002FYPS-01U1B0 2TB - 45.9%
RAM: Unknown 4x4GB - 61.4%
MBD: Gigabyte GA-Z68XP-UD3
 
Seems to work with GTX 1070
So am I safe to assume my MB should be compatible with the 1080 then?

OJS48, Keep us updated as you go through everything. If you can get to a local PC store, they may be able to test the card for you in one of their newer machines. I had 2 of my 780ti's tested for $10usd because I had to ship them to Okinawa from Florida and the shop was very helpful in testing them.