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Here is someone who repairs the video chips in your model of iBook: http://cgi.ebay.com/iBook-G3-Logic-Board-GPU-Repair-500-600-700-800-900-MHz_W0QQitemZ270500614697QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3efb17d229#ht_2489wt_1104