Hello everybody, till 10 days ago my macbook worked fast and well, now it start very slow and crash after some operations or 1-2 minutes. I'm from Italy but now I'm in Prague for studying for 6 months, and I don't have the installation dvd with me. I tried to bring it to a local apple store but they did not find any problem ( I really don't know how !). However, the macbook still doesn't work and I try a complete hardware test and this is the result: 4SNS/1/40000000: Th1H- 75.204 Anyone can help me ? Thank you so much and sorry for my incorrect english.