Satellite M40-265 LCD display shows the full picture but squashed on two-thirds of the screen
When my Satellite M40-265 with ATIMobility Radeon X700 and omega drivers 3.8442, Windows Xp, Sp3 boots by setting the LCD + Analog RGB, the displays initially only on the extern screen After booting can be switched with Fn + F5 to LCD. Then appears on the LCD display the full picture but only two-thirds of the screen, the right third is black. This works so well when the screen on external is not connected while booting.
When set to Auto Select the display computer starts up only when a extern screen is connected, then after that, I can switched to the LCD.
Inverter damage is excluded because already checked. Visually inspect the cable for the LCD display shows nothing. Next to the left speaker, a ground wire (black) screwed, but it is s’t anywhere connected.
Booting in safe mode is only possible to use a full screen on external
The M40 is an oldie… not sure about available settings in BIOS and in graphic card options but I think you should check the ATI Catalyst settings.
I remember that ATI catalyst supports some options like “Image Scaling”. Here you can choose the option “Scale image to full panel size”
Furthermore you should set the resolution on the internal display to the native resolution 1,280 x 800
I think the external monitor supports other resolution which is not the same like the internal screen.