flicker on and off? Well, if it doesn't do it any other time I say forget about it. If it's a new problem, or it happens randomly when booted, I would guess the monitors failing, that or theres a prob. with you video card. If it doesn't do it after windows boots and or it's been doing it as long as you have had your computer, it's probably some power quirk with the comp or video card and I wouldn't worry about it.