weird flicker/noise thunderbolt/hdmi


my 42in lg tv creates weird flicker , noise every few minutes @ random. last half second if that. noise can very, can pop, creak, snap. there isn't noise

ideas causing this, , solution? had same monitor hooked 2012 mac mini , there wasn't issue. ran way 3 years.

edit/ i've noticed it's happening, tv/monitor generate hum second

http://vid186.photobucket.com/albums/x108/pheonixofire/img_0562_zpsz3slw4yw.mp4
 



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