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15 inch "Desk Lamp" iMac G4 700MHz M6498 PowerMac 4,2

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Yellow vertical video lines

My daisy has a yellow vertical line pattern, and freezes. Also shows the same on a second monitor. Is there a separate video board? Is a complete motherboard, if required, available?


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The fact that it does this with an external monitor indicates a failed GPU (Graphics Processing Unit). Sorry to say but it's integrated into the logic board. The 700 MHz is Apple part # 661-2589. You can also use the 800 MHz board in your machine, part # 661-2575.

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Jim will be eternally grateful.
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