hi, i have just bought a 19" lcd monitor and it looks great but whenever i use it for a longish period (about an hour) i start to get a headache, my eyes are fine but my head hurts like hell. i upgraded from a 17"crt and never had this trouble even when i had been looking at the screen for several hours. has anyone here head of this problem or know anything i could do about it? i have tried changing the refresh rates between 60-180hz and there doest seem to be much of a difference. any advice would be greatly appreciated, thanks.