please answer this, do you go straight into the windows lock screen or you see the windows loading screen? (my laptop goes straight into windows lock screen with external monitor, the rest is displayed on the main screen) I assume so, and let's fix that.
After hooking up your laptop to external monitor, turn the laptop on, and immediately press fn + f4 (the key with a display icon).
if f4 key doesn't have a display icon on it, press fn + the key with display icon.
this should switch to the secondary display from boot itself. (make sure you press the keys just as the your press the power button for this to work). although I didn't find any guide or documentation from Acer, many other laptops use this method so it's likely to work. this will also allow BIOS to be displayed on the secondary screen. 👀
now restart the laptop. (if you still don't see any output on the secondary display, you should repeat the above process, cause you may have pressed it too early or too late 😕
You have 2 methods to try,
1) going to windows safe mode and then reverting your driver update/reinstall it.
2) go to the bios and then change the GPU to integrated graphics so you can boot into windows and then change or modify the drivers.
1- Safe Boot method: since you see the output now, it's easy to get into safe boot(kinda).
what you have to do is, when you see the windows logo at boot, immediately press and hold he power button to force shutdown. now turn it on again and do the same thing. you should do this 3 times (or 4) and the third time (or 4th) you'll see a diagnosing pc text, instead of the loading icon. you shouldn't press the power button at this point. wait. After your PC goes to the Choose an option screen, select Troubleshoot > Advanced options > Startup Settings > Restart. this will reboot the laptop(sometimes). after reboot, you'll be presented with some options, from that chose the respective number with 'enable safe mode with networking'. (number 5 or f5). now your laptop will enter safe mode, so update/reinstall or downgrade the drivers from there. restarting will get out of safe boot.
2 - BIOS method: Now assuming you have the motherboard logo output on the screen, press the necessary key to get into the BIOS.
from here, you can change the GPU to integrated graphics (if you have it). please look into a guide online on how to change it (I can't type this much 💀) and restart.
Good luck blud 🙌