I have a Dell P991 Flat Trinitron monitor. I've been running at 1024x768@85Hz since i got it and I'm noticing flickering (most evident on white backgrounds).. so I upped it to 100Hz and the flickering seems to be gone.. However, I posted this problem on Dell's forum and I was told that i should leave it at 85Hz, because I will ruin the monitor in the long run if I leave it at 100Hz.... is this true? Should i set it back to 85?