Inspiron 15 5000 Gaming won't use NVIDIA Geforce GTX 1050 display adapter

TAJH,

Reinstall the Nvidia drivers back into the system and reboot.

How to make the nVidia graphics processor the default graphics adapter using the NVIDIA Control Panel

Drivers, Downloads and Manuals

The way that system works (and in fact the way the vast majority of laptop systems with discrete GPUs these days work) is that the Intel GPU is the only one wired directly to the display outputs.  The NVIDIA drivers try to detect when a running application would benefit from its extra horsepower, and when they do, the NVIDIA GPU kicks in as a render-only device, passing completed frames to the Intel GPU for output to the display.  You can also go into the NVIDIA drivers and manually force certain applications to use the NVIDIA GPU if you find that the drivers don't automatically enable the GPU for that application when they should be, or you can right-click the application shortcut and choose "Run with graphics processor > NVIDIA" if you want a faster way to test this on a one-time basis.

However, 3D Vision (aka stereoscopic 3D) is probably still going to be a problem, since that may require the NVIDIA GPU to have direct control of the display outputs, which isn't possible on that system.  Intel GPUs also support stereoscopic 3D, so it MAY be able to pass it through, but I kind of doubt it.

You also of course need a display capable of receiving a stereoscopic 3D signal -- do you have that?

In addition to the above, here's NVIDIA's page for 3D Vision requirements: www.nvidia.com/.../3d-vision-system-requirements.html

As you'll see, the supported GeForce mobile GPUs stop in the GeForce 600 Series, and you have a GeForce 1000 Series.  I suppose it may still be supported and NVIDIA simply isn't bothering to maintain that page anymore (since stereoscopic 3D sort of came and went), but another possibility is that back in the days of the listed GPUs, having a discrete GPU meant having ONLY a discrete GPU, not a discrete GPU plus an integrated GPU.  Today's "hybrid" design exists because the Intel GPU is actually integrated into the processor itself when it's present, and most Intel mobile processors have it, so it's very rare to find systems that either a) use CPUs that don't have an integrated GPU, b) completely disable that GPU in favor of a discrete GPU, or c) allow the system to be switched between giving the Intel GPU or discrete GPU direct control of the display outputs.  The Precision 7000 Series models are an example of that last design, implemented as a BIOS-level option, but that requires a more complicated and expensive motherboard, and the use cases for that capability are very limited, which is why it's so rare.  For the average user, having the discrete GPU active whenever an external display is connected or even active just to drive the built-in panel would just mean reduced battery life with no benefit.