Dell E5450 nvidia 830M not detected

[UzY3L]

Hello,

I have a Dell E5450 with a dedicated GPU on the motherboard. I took it apart and checked: there are both the GPU and the RAM chips on the motherboard.

Going by Service TAG, the configuration is listed as having: 338-BFGQ : Intel Core i5-5300U Processor Base for additional Security, NVIDIA GeForce 830M 2G Discret e GPU

However, the GPU is not detected in either the BIOS or in any version of Windows (XP/ Vista, 7, 8.1, 10). System is 100% stable.
I have even tried all BIOS versions, from A05 to A23 to A02 and back.

I know that 99.9% of laptop manufacturers always push the video display through the dedicated GPU so that the system is built to fail a.k.a. even if you never use the dedicated GPU, if it fails, you will see artifacts / glitches/ crashes on your display even when only using the Intel iGPU.
Is this that 0.1%? Does such a thing exists?

The nvidia GPU on the motherboard gets hot = it gets power.
Also, in Dell Diagnostics, Video Thermistor shows up but all values are n/a.

Inspection with a magnifying glass didn't show any reball/reflow attempts.
I have no idea what to do. The system works fine, it's just not seeing the nvidia 830M, at both the BIOS and OS level.

Please help with this issue. Thank you!