same ra na dyapon na symptoms brad. extended desktop man gud na na settings.
the gpu acts different on an extended display or external output
i have been working with DELL for nearly 4 years since 2007 and i have encountered that NVIDIA GPU issues everyday with my clients
we had tried replacing lcd kit (including the lcd flex cable) and it will not work (tested and proven based on experience)
we ended up still replacing the motherboard.