I bought my 27 imac in July last year. A few days ago it refused to power on, and I sent it back to the service centre yesterday. I dont know whats wrong with it yet, but the apple tech on the phone kept trying to sell me Applecare for another 2 more years. Should I buy Applecare? Generally I dont buy extended warranties since they tend to be a ripoff. But since my imac has already exhibited a serious problem, Im wondering if it would be more prone to problems in the future. What do you guys think?