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

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Why screen doesnt turn on?

When I turn on my computer, it starts and you can hear the sound so you know its on, but after a while it just stays black and it doesn't do anything. It just stays black all the time. How can I fix this?

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Try using the F1 & F2 keys to turn the brightness up or down, it might be all the way down. F2 goes up, F1 goes down.

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It is usually a failure of the solder joints beneath the graphics chip. If you press down hard on the left of the trackpad you may get a display, as it puts the chip back in contact with the logic board. There was a number of recalls to replace the faulty boards and a class action against Apple in the Netherlands. You can sometimes fix it by taping a 50p piece to the heatshield below the graphics chip, so it presses on it and keeps it in contact, but it means taking the back off the iBook and this is not for the faint hearted. There's tons of stuff on Google about this. If the earlier suggestion of using an external monitor works, it's a broken cable to the LCD screen, where it passes through the hinge, and not the chip coming away from the board.

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To check out the graphics card plug it into an external monitor.

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candy sarà eternamente grato.
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