I ran a few benchmarks on my Powermac 2.7 and my friends 2.3, and to my surprise, my friends 2.3 outperformed mine. Although mine has 3 GB more mem as well as .4ghz faster, it underperformed my friends. The reason is because my HD scored a 49 in Xbench and his scored a 102. I have noticed that my hard drive has been lagging. Is there a way to convince apple that my hard drive is faulty?