IBM T21 keeps switching to external monitor

[valucomputers]

I have an IBM T21 and whenever i switch it on, it turns to external monitor. It will go as far as the Windows 2000 loading screen and then as it loads up windows, the screen goes blank and you have to press FN+F7 to get it back up

any ideas?

 

[Kornowski]

Does your Video Card have two VGA ports on the back? You may have it plugged into the secondary VGA port.