I have this exact problem. I tried all suggestions in post with no success. I am using this monitor with my new Dell E6540 Latitude laptop. The monitor works fine with the VGA input, but will not work with the HDMI input. It certainly appears that I have a defective HDMI connector in my monitor! I don't want to return the monitor to Dell for replacement because I've read in other posts that Dell will ship a refurbished monitore that more times than not will have defective/dead pixels. I'd rather stay with this monitor but use it with the VGA cable. Too Bad! This leaves a bad taste in my mouth for Dell products.
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