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.