Ha ha!!
I had the exact issue with my xps 1530 last year!!
Try explaining it to the call center which is in india.
Convo went something like this
Me "hi there, yes i appear to have a bug in my screen"
SD "ok what is the bug sir?"
ME "erm a little creature"
SD "oooook. whats it doing?"
ME "Nothing, its slap bang in the middle of the screen"
SD "ooooook"
Realising i was getting no where!!
ME "Ahh actually its a block of dead pixels. 4x3"
SD "ahh oooook. i will book an engineer to replace the screen for you"
Next day the engineer turns up, "that looks like a bug to me mate" Me, "Sure does, can you swap it out?" Sorted ha ha!!
Was funny at the time anyways
