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I don't see any 190s in their list. Could it be E90f? CRT or LCD?
Anyway, if your settings are at the monitor's limit it could do what you describe semi-randomly. It may be that monitor has an issue that makes it slightly less capable than the spec. What are your resolution and refresh settings? Have you tried dropping them to see if there's an improvement in behavior? Best absolute test would be as Dilbert suggested. Exchange temporarily with someone else and see if the problem moves.
Not to be stubborn, but you've pretty much eliminated everything else.
As for the processor, depends what you mean by "stays on and running." I took that to mean it responds as you might expect a normal system would to keypresses and such besides your not being able to see anything. If it's just making fan/HD noise but is otherwise locked then you could be on the right track.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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