Hi. I'm David, and I'm happy to help you.
The fact that laptop #1 spins endlessly when shutting down is a clue. I suspect that the Wi-Fi adapter has likely hit a driver deadlock at the hardware level, leaving it completely frozen. Therefore, when you try to shutdown, Windows gets stuck waiting for that unresponsive card to power down.
Since a standard restart won't clear a frozen hardware controller, performing a power drain usually fixes this on Dell laptops.
Here is how to do it:
- Force a complete shutdown by holding down the power button until all lights turn off;
- Unplug the charger and disconnect any attached USB devices or accessories;
- Press and hold the power button for 30 seconds, then let go;
- Plug the power adapter back in and start the laptop normally.
Please let me know how it goes.
Feel free to ask any questions you may have.