Model M6497 or A1005 / 500, 600, 700, 800, or 900 MHz G3 processor

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What causes the display to light up intermittently when opening up ?

Could this problem be a worn display cable?

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The problem is most likely the inverter cable. But G3 iBooks are finicky when it comes to display issues. Your best bet is to hook it up to an external monitor to see if the problems continue. If it's the same on the external monitor, it's most likely the graphics processor on the logic board. If the problems don't manifest on the external monitor, the problem is most likely the inverter cable.

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You might also try the testing procedure I outline in my answer to this question (related to the G3 video chip flaw):

Why does my iBook randomly freeze?

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