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12-10-2012 10:16 PM
Well there is no BIOS update for the Extensa 4420 series so this may be an issue with the backlight on the unit.
12-10-2012 10:44 PM
it will do this on ac with battery installed but not on battery only ac unpluged or ac only battery removed
12-11-2012 02:27 PM
Well the other thought here would be this may be an issue with the power settings on the unit. Ty going under the Control panel and adjusting the settings for the display.