ssd problem installing

hey everyone

when i put this pc together i've built it with a m.2 950pro, install win10 from a usb, system is awesome.

problem, i wanted to install the crucial for games, i know the m.2 shares pci-exp, but i've tried all the sata ports and new cables while using onboard video (pain in the neck getting to the cable with the 1070) am i missing anything else or did the crucial die ? (heard they had problems that once powered down they wouldn't start ? the crucial is from old system that was also running the win10 upgrade

asus z170a
i7-6700k @ stock + H60
g.skill aegis 2x16gb 2400mhz
evga 1070 ftw
m.2 950 pro

Thoughts ?

i'm going to remove the m.2 reset the bios and try the crucial, no access to spare parts.

storage is external, 4x3TB seagate for now, once i know what's going on i'll reevaluate

i've taken out the 950pro, reinstalled only the crucial M500 and tested all sata ports with new cables, won't be completely satisfied until i test it with a new or working ssd