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Latitude E6420 HDMI output jack won't work

I have tried a LOT of different things to get my HDMI port to work but I will follow any advice in specific order if anyone can suggest a good starting point. Ideally, this is a common problem and I just have yet to find the resource to address it.

Even though I have an integrated Intel HD Graphics 3000, device manager indicates that "NVIDIA 4200M (PCI bus 1, device 0, function 0) Windows has stopped this device because it has reported problems. (Code 43)." Is this driver only for monitors that I would hook up to my Latitude that contain corresponding NVIDIA hardware/software? (i.e. does this NVIDIA 4200M have anything to do with why my HDMI output jack won't work?)

Please help as I have a Nixeus WQHD 27" Ultra High Resolution (2560 x 1440) that I am dying to use to its full potential. I'd even appreciate recommendations for an external GPU if it is that to which I am relegated .

Besides my Latitude E6420 (tag B7H07R1), I also have a Studio 1558 (tag 4MZ5DN1) if I can get my WQHD monitor to work on that any easier.

Thanks in advance and have a happy and SAFE Memorial Day weekend!

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