new pc trouble prestations

[Fabio Lucinotona]

I bought completely new components to build a pc (on warranty)

Before I bought mobo Gigabyte Aourus rev.1 but because of any issue they changed me with aorus UD4 that while I tried with to swith on (graphics) it toke fires;
so they changed back with a new Aourus rev.1

AORUS GIGABYTE (Socket 2066) rev. 1
NVME M.2 SAMSUNG 970 EVO 500GB
DDR4 TRIDENTZ 4000HZ
INTEL I7 7740x
GPU NVIDIA 1050TI 4GB

I have good performance in particular about graphics just after install on a clean installation with WINDOWS 10 but after few days I start to have issues lags and
somethimes display doesn't start or just after unconnet and reconnect GPU it's power wire or main power supply Thermaltake 850W I triad even with NVIDIA 610 and 730 they worked for some time but the issue that sometimes display dosen't start there's and I tested several dispalys with
VGA DVI and HDMI output input

I'm using Liquid Cooler RGB24 by Coolermaster

Another Issue is that I can't get analogic sound even after REALTEK HD and normal Realtek drivers just Digital output works fine

After made userbenchmark test it resulted 98th on 100 with the same configuration.

Any Suggest?

I uploaded a pair of tests' screenshots

[Jhieminga]

Yes, get in touch with the shop that supplied the parts. This is not the type of problem that can be diagnosed based on a forum post.

[Helix Von Smelix]

no plastic between the heatsink and CPU?
CPU and GPU temps?
Disk access %?
Amount of RAM installed equals what windows can see?
PCIe lanes, data show 16, can't believe its that low.
Get an M.2 adapter to SATA and switch the M.2 to a MoBo SATA
Many be two fans on CPU cooling blow against each other?