Problems with monitor autoajustment

Hello,

I have Samsung SyncMaster 2223NW, Asus Nvidia 9600 GT on a opensuse 11.0 desktop. I have noticed sometimes the screen image falls out of focus. This could be corrected by pressing “Auto” button on the monitor, though possibility of doing this few times each day does not make the point. I heard that poor PSU could cause voltage fluctuations leading to inability of automatic image correction. I have INWIN 450 power unit (could find out the model if it is crucial).

What do you suggest? Did you experience such a problem? Could it be a problem of nvidia settings (I remember tweaking them to maximum performance)?

Thanks. I appreciate your time.
SDA