Question about Apple Powermac G4 Quicksilver Logic System Board 820-1342-b 630t-3827 630-3828

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Powermac screen developed fine black grid and won't operate properly

I have an Apple Powermac G4 Quicksilver Logic System. The screen suddenly developed a grid of fine black lines across it. When I tried to go to various sites it would ghost the sites and sort of wave colours, etc. I plugged it in to another feed and the screen was fine. It was suggested it was the video card. How do I find where this is? Any suggestions?

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Isolate the problem to see if it's the screen or video card by connecting another monitor to the computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok without a problem then your original screen is bad and your video card is good. If the Borrowed monitor displays the same problems as your original then your video card inside the computer is bad.

Posted on May 30, 2012

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Posted on Jan 02, 2017

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I have a powermac G4. When I turn it on it chimes but there is no display and a red light on the motherboard. Checked the power supply - all voltages are good. Bad motherboard or video card?


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Do you hear mechanical activity from the drive? It is possible the machine is running fine except for the display or graphics card. Try another display. If you have another Mac, you can also try starting the machine in target disk mode by holding down the T key at boot (your machine was built in 2001, so it should have this feature) and see if you can access the internal drive from another machine. This should eliminate the motherboard as the culprit.

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If it is the power supply, you will not be able to switch it on again. Your data on the HD should be safe (unless the smell was coming from that - - I've had it happen!). So when you get to the workshop and you've had your quote, if you decide not to go ahead with the repair, ask the workshop to remove your HD and put it into an external case so that you can plug it in to another Mac and continue using it.
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