My father has a Lenovo S10 laptop. While on vacation, he connected it to an external monitor and disabled the laptop display with the Windows Display Properties Dialog. Before leaving, he disabled the external display thinking the laptop display would automatically enable. It didn't.
Now when we boot the laptop, neither display works. The Fn keys (e.g. Fn + F2 and Fn + F3) are of no use. I can get the laptop display to turn "on" and "off" but it only displays blackness. ("On" is an illuminated blackness.) I can also hear the external monitor click on when I use the Fn key to switch displays, but again, it is blank.
The BIOS screen is fine. The Windows XP loading screen is fine. But when the operating system loads, it doesn't know what to do. Safe mode only shows the boot text. It doesn't actually show the Windows OS.
I have reconnected the external monitor and booted into safe mode, but the result is the same.
How do you reset Windows XP display settings while blind to Windows XP?