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Hello, My screen is acting in a altered/hacked way. it seems to pulsate or vibrate and there is some shadows overlaying (gohsting) on desktop screen. it looks like a terror corps invaded the screen. It first occured years ago on my older mac After opening files downloaded from a torrent site.( not realizing danger) and got on my new laptop now, not knowing it were those files on the external HD that got me in trouble the first time. The screen gohsting, overlayer and slight pulsation started immedeatly after opening the files and got me scared. Also i found 400plus photo's on my HD of very disturbing nature which were probably downloaded with the torrent. I have tried already the obvious solutions : clean installs, resetting nvram running in save mode (which helps a bit) etc. but it only got rid of a part of the problem. and still the screen is not completely as it should be. different anti virusses didn't show anything. bitdefender, clamxav, and my full malwarebytes program. i have searched on the apple support community but no real similar problems are reported I am still in search of a solution as i realy can't work on my macbook. and wan't to look deeper into this. i am worried it is some code/programm that has changed my startup settings. I have checked my hardware by official apple repair center which didn't show any problem and changed the screen and logicboard . Is there anywhere i could start to look or what i could do to further find this malicious alteration of my display? as malwarebytes didn't find anything should i run other malwarebytes programs ? Many Thanks for all possible help! it is very much appreciated! kind regards Johny I have been with this problem for some time now