You can turn the backlight all the way off via keyboard, so it's essentially black, that's it. But the LCD is technically on. It's possible there is a (free/share)ware that does it but not that I know of.
Again, the spanning hack is essentially innocuous, merely enabling spanning, but Apple might have had reasons other than intentionally crippling the iBook/consumer to differentiate from Powerbook/pro.
But this second failure had no reason other than the hack. I had kept the iBook open on my desk for a year, unmoved with no problems. Did the hack and the video board fried 2 weeks later. Connection? Not for me to say conclusively.
"Peace cannot be kept by force. It can only be achieved by understanding." - Albert Einstein
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