Hi, I just got a new MacBook Pro today (2.4Ghz i5) and it kept freezing randomly, such as opening safari. I open disk utility, it says that S.M.A.R.T. is verified, when I verified the disk, it said "invalid node structure" and to repair using the Mac OS disk. I booted from the disk, disk utility failed to repair twice, but after the 3rd repair, it said repair was successful, but after a few days, same problem "invalid node structure." I've repaired the disk many times and I always get the same result a few days later, I've also reformat the laptop 3x with same problems reoccurring after a few days. I read that using disk warrior was best to solve these problems, except I there were mixed results, some people said that it fixed their problems, others said it was just a temporary fix, so I don't wanna pay for a program that may or may not fix my problem. Last experiment, I popped in the HDD into my sister's MacBook Pro (2.4GHz Intel Core2Duo) and did a clean install. After a few days of use, it starts to slow down, ran Disk Utility, S.M.A.R.T. status is verified, clicked repair disk, and same thing "invalid node structure." I went to apple, Apple "Genius" said that there was nothing wrong with my laptop and just told me to do a clean install, which I did many times already. They kept it over night and called the next day to say that there was nothing wrong... Having said this, how accurate is the S.M.A.R.T status? I search google and some people say that "Invalid node structure" is a sign that the HDD is failing. Any of you guys experienced this problem, where the S.M.A.R.T. status is verified, even though the HDD is dying? I don't have money to experiment and buy another laptop HDD to install just to test this out so can you guys tell me your experience? Thanks.