Alright, I think the last situation was a fluke, I can still use the external monitor. Right now, I have the driver from ASUS installed, and I was able to install the NVidia driver as well. After a bit of looking around, this is the situation I'm in:
-If I keep the Intel driver on, everything seems to work aside from the laptop's built-in LCD. I found through the screen resolution window that the computer can't even SEE the LCD, the external TV is now the primary monitor, and there is a second "intel WiDi" display that is not connected to anything. No mention of the internal screen here OR in the HD Graphics Control Panel. Even though I can still use the touchscreen functionality, the screen is off.
-If I disable the Intel driver in the Device Manager, I can use the laptop LCD just fine (and it helps that disabling a driver carries over through restarts,) but some important functions no longer work; mainly sleep and display switching. The external monitor ALWAYS mirrors the internal LCD, for some reason it can't detect a separate monitor and just passes the video through.
So WHY can't the Intel drivers see my laptop's LCD, and how can I fix that?
Base on your description, yours system is a Hybrid Graphics system therefore it requires special drivers.
This problem you are having definitely seems to be a driver conflict so I recommend you uninstalling both drivers and then install the Intel® Driver First. Here you can download the latest:
It is important to say that OEM drivers include special features that will work specifically for your computer. This is why installing the driver from the Computer Manufacture is very important.
Thanks for the information. I've already done what you said: I've re-installed the Intel driver multiple times, at the moment I am using the one from ASUS, as you suggest.
In this case, my best recommendation is to report this problem to Asus due to the special configuration your system requires.