I've read all the toing and froing re "who, what why.." since the first PrevX blog from November and subsequent blog entries Seen MS deny. Seen Prevx recant ( handled well imo in a tricky situation) and caught the reference to malware techniques: & No specifics re "malware" or "any other program" Is the postulation that the black screen is associated with some mal ?? If so which/what ?? I don't expect PrevX to have the answers to any/all of the possible other security apps/software combos that may do this. ( I would like some of those posters with "4000+" machines to tell us what they are NOT running ) Seems to be a common theme being pushed that some malicious software is being touted as cause of BlackSOD. May we have some clarification re possible malware please.