Boot Confusion, Need Help

[Daydream203]

Okay i'll try and explain the best i can, honestly this is the most confusing issue that has ever occurred to me.

So Setup is,
B250F Motherboard.
I770k @4.5 Ghz
16GB DDR4 3000 Crossair Vengence 

GTX 1070

Vertex 3 60GB
970 Evo Nvme 500GB

2x 7200 HDD's

Orgianlly everything was fine and no issues, running like a dream. 
Then i swapped my old gtx 970 for the 1070 and had to remove all power connectors from psu to get it into my case.
Shortly after everything was back installed i found i was unable to boot into windows, kicking me back into UEFI,

Checked all m.2 settings in bios, checked to see if anything had changed but nothing had, i Wonder if it could be a power supply issue? when gpu load spikes when drivers are loaded booting? GPU felt hot 
But alas, no sucess. After F***ing about for a good hour i gave up on the NVME and decided to boot from my SSD instead. *This is the weird part* Booting my SSD actually instead booted the NVME which i couldn't directly boot from BIOS. 

TL:DR: NVME wont boot, but the SSD can boot the NVME. 

[Uptivuptiz]

OS on the NVMe could be corrupt. But before coming to that conclusion have you tried unplugging all storage other than the NVMe drive and booting?

[ckinfos]

1 hour ago, Uptivuptiz said:

OS on the NVMe could be corrupt. But before coming to that conclusion have you tried unplugging all storage other than the NVMe drive and booting?

Check also if in the force to remove the cablings...you didnt by error pulled somehow out any cable. try reconnecting all data cables too or push them back in. did you reset any bios option for the installation, maybe you turned the default settings on bios? Something else that comes to me is if your windows license has anything to do with it possible many reactivations? SecureBoot? installing a graphic card like that does not draw that much power at idle so psu maybe not the problem.

[Daydream203]

Hi guys, thanks for responding. 

Iv'e tried having only the NVME as storage unplugging all other devices including USB. The bios can see the NVME it will attempt to boot it, then you'll get the little "_" blinking in top left then return to UEFI.  However, If i plug back in my SSD with the NVME, and select the ssd as the main boot, it'll use the ssd to get past where it was previously stuck and proceed to load windows from the NVME, like a RAID that magically decided to compose itself. :l 

Also, Checked all bios settings, tried clearing boot keys, Leagacy/ UEFI mode on m.2 boot, i tried disabling all sata, It's almost as if windows has been split onto 2 drives in order to boot. makes no sense.