I bought an iBook in 2003 and every year the screen goes completely blank causing Apple to replace the logic board per my Applecare aggreement. After the 3rd time this happened, I was not satisfied with a repair, as there is OBVIOUSLY something wrong with the computer causing the logic board to fail. The higher-ups at Applecare refuse to replace the computer. What should I do? I don't want this to happen a 4th time.