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White (Light Grey) Screen

613 Views 3 Replies Latest reply: Oct 31, 2012 3:55 AM by macfan7 RSS
macfan7 Level 1 Level 1 (0 points)
Currently Being Moderated
Oct 28, 2012 2:40 AM

A friend has asked me to investigate a G4 PowerBook - DVI model which he thought was dead. On startup, the normal chime sounds but then all you get is a white (or possibly very light grey) screen i.e. no Apple logo and no spinning cog. Having tried resetting PRAM/PMU with no success, I connected an external monitor and that displays the desktop and the computer can be used normally - it's just the laptop screen which refuses to display although the brightness control works.


Clearly it's not worth spending money on a ten-year-old machine but any suggestions as to what I could try? I wanted to check the screen connection but can't easily find the connector.

  • Texas Mac Man Level 8 Level 8 (44,220 points)
    Currently Being Moderated
    Oct 30, 2012 6:18 AM (in response to macfan7)

    You can use this site to locate the connector.


     Cheers, Tom

  • Texas Mac Man Level 8 Level 8 (44,220 points)
    Currently Being Moderated
    Oct 30, 2012 6:24 AM (in response to macfan7)

    Could be a bad inverter board which causes no backlight. If you shine a flashlight on the screen do you see anything?


     Cheers, Tom


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