Quote Originally Posted by Particle View Post
Change your DP cable. You might have one of those ones that has errantly connected the power pin between both sides of the cable. It causes all sorts of goofy problems, and I wouldn't be surprised if this is the reason why your error indicator is lit even when power is removed.

NEC has posted a document about it. If you're handy with a multimeter, you can check your cable yourself: http://www.necdisplay.com/cms/docume...ort_Notice.pdf
It happens on both cables so must be a design fault? I love you anyway! Thanks for the white paper on it.