Samsung T260 Manual page 64

You have to
 EDID input (Analog and Digital, HDMI)
 Firmware install – MICOM S/W input(use DDC manager)
 HDCP Key
 PC Auto Color Adjust
-.select language "English" in OSD, then hold
down Enter key for 5 seconds
 Factory Reset
-.setting to Contrast and Brightness '0'.
-.Push the menu button more than 5 seconds
-.select Reset.