All 20 TFTs in this room (apart from 1) have all started flickering. They were all set to 60Hz but to reduce (or speed up) the flicker, I have to set them to their maximum of 120Hz. It is still slightly noticeable on some. (if you look sideways/peripheral)
What could have caused this? Power fluctuations/instability? Flourecent lights (no lamps have been changed)?
Any ideas greatly welcomed...