I was using my macbook in windows xp yesterday and suddenly i saw that the computer speed seems fall down then i restart the computer, choosing windows xp again. But it goes in to F8 Mode and i chose start normally, it appeared a blue flash which maybe said that my computer got a hardware problem and restart automaticallly. Then i start it up normally with MAC OS and it couldn't start up. After about five minutes it goes to a black screen which i never seen before with these : disk0s2: 0xe0030005 (UNDEFINED). disk0s2: 0xe0030005 (UNDEFINED). /etc/master.passwd: Input/output error dis0s2: 0xe0030005 ( UNDEFINED). -sh: /etc/profile: Input/output error disk0s2: 0xe0030005 (UNDEFINED). -sh-2.05b# Oh, there is clicking noise as well ( every 3-4 seconds ) I have been using this macbook for about slightly more than one year and it used to be very good. Thank you for your helps.