I have a Sony CPD 420GS monitor running on an ASUS GF4 on XP. I usually run my desktop in 1152x864. The monitor has worked fine this way for years, first in 98 and now XP. It was working fine today also until I rebooted (I hadn't changed any settings) and my monitor gave me an out of scan range (rear input) error message. I've switched back to 800x600 until I can figure out what the problem is. Any ideas anyone?