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New M.2 gets stuck at reboot even on a fresh install

HP Recommended
Envy 750-247c
Microsoft Windows 10 (64-bit)

HP Envy 750-247c i7-6700/24gb ram/nvidia 980ti/700W psu/SATA Sandisk SSD 960G/m.2 nvme Silicon Power gen3x4 1TB ECFM12.2. If I use the M.2 as the boot drive (with or without SATA SSD as second drive) the computer won't reboot properly, either gets stuck just before showing the bios screen or just after. Usually allows me to hit control+alt+delete, sometimes requires me to power off completely. Either way, it will boot up fine after. Even during the install process it will hang. Tried a fresh install of win10 1909 & 2004 + latest drivers for all devices, even tried Intel's nvme drivers rst17.7 and other various drivers chipset10.1.1.18/wifi/bluetooth/realtek nic/etc. Latest bios (ROM Family SSID 2B4B A0.59 Rev.A Feb 12, 2018). Reset bios to defaults, tried AHCI & RAID (which probably doesn't matter for M.2 use). Passes HP uefi/windows diagnostics. Disabled fastboot, no change. Stuck as to what to try next within reason (not in the market for motherboard/CPU replacement currently). Computer works just fine if I use the SATA Sandisk SSD 960G (sandisk tools says latest firmware/healthy) by itself or as the primary and the M.2 as the secondary, so it "seems" to be M.2 related. Halt on reboot wouldn't be that big of a deal, but I have this machine joined to the Windows Insider Program fast ring so it gets constant build updates & needs to reboot a good deal with those updates. Crystal Disk Info reports health status 100% Good, CDM speeds report pretty close to what I would expect (using Windows nvme or Intel nvme driver, no real change) - [Read] Sequential 1MiB (Q= 8, T= 1): 3240.976 MB/s [ 3090.8 IOPS] < 2576.77 us> Sequential 1MiB (Q= 1, T= 1): 1954.816 MB/s [ 1864.3 IOPS] < 535.73 us> Random 4KiB (Q= 32, T=16): 1653.361 MB/s [ 403652.6 IOPS] < 1218.68 us> Random 4KiB (Q= 1, T= 1): 41.517 MB/s [ 10136.0 IOPS] < 98.32 us> [Write] Sequential 1MiB (Q= 8, T= 1): 3028.067 MB/s [ 2887.8 IOPS] < 2758.53 us> Sequential 1MiB (Q= 1, T= 1): 2415.482 MB/s [ 2303.6 IOPS] < 432.95 us> Random 4KiB (Q= 32, T=16): 1301.872 MB/s [ 317839.8 IOPS] < 1583.47 us> Random 4KiB (Q= 1, T= 1): 137.311 MB/s [ 33523.2 IOPS] < 29.58 us>


Using UEFI

Note this M.2 SSD worked fine in a Dell Optiplex 5040 that more or less has the same specs as this HP Envy.

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