Samsung SyncMaster 591S Manual page 72

If the signal transferred from the computer is the same as the following Preset Timing Modes, the
screen will be adjusted automatically. However, if the signal differs, the screen may go blank while
the power LED is on. Refer to the video card manual and adjust the screen as follows.
Table 1. Preset Timing Modes
General
PowerSaver
Display Mode
Preset Timing
Modes
VESA, 640 x 480
VESA, 1024 x 768
VESA, 1280 x 1024
Horizontal Vertical
Frequency Frequency
(kHz) (Hz)
37.500 75.000
68.677 84.997
79.976 75.025
Horizontal Frequency
The time to scan one line connecting the right edge to the left edge of the
screen horizontally is called Horizontal Cycle and the inverse number of
the Horizontal Cycle is called Horizontal Frequency. Unit: kHz
Vertical Frequency
Like a fluorescent lamp, the screen has to repeat the same image many
times per second to display an image to the user. The frequency of this
repetition is called Vertical Frequency or Refresh Rate. Unit: Hz
SyncMaster 795DF/795MB
Pixel Clock
(MHz)
31.500
94.500
135.00
Sync Polarity
(H/V)
-/-
+/+
+/+