Powerbook G4 12" (A1010) blank screen
After powering on, the machine chimes and after a short while screen's backlight turns on but the screen stays black. When an external monitor is connected, the image can be seen on the external monitor.
Googling shows that many have fixed this error by resetting PRAM. That didn't work for me.
Here's a video of the symptom: https://www.youtube.com/watch?v=ooyFBf8KdzA
The screen appears to be gray on the video while it's actually black. The gray color is produced by the LCD backlight and the screen appears actually black when looking it on normal daylight. I filmed on a very dark room to see if/when the backlight turns on.
Could it be a bad cable?
PowerBook, Mac OS X (10.3.x)