I bought a used macbook yesterday morning and everything seemed to be working properly at first, but by the end of the day it started having a problem when booting up. Here are the specs: 2.0ghz Core Duo 2 gigs of RAM (updated by previous owner) 160 gig Hard Drive (updated by previous owner) Everything else is the same as this listing. The problem: when booting up, the screen turns on, but just remains white, without showing the apple logo and spinning circle. I left it like that for a good 10 minutes, and it never continued to boot, it just stayed in that state. I shut it off, then started it in safe mode, which worked fine. From there I restarted it, and it worked normally. The same thing happened again later (white screen, turn off, boot in safe mode, boot normally). Based on what I found with a few quick google searches, this could be caused by memory that doesn't work properly with apple products. I don't want to go out and buy another 2 gigs of memory, especially if this might not be the problem. Does anyone know what I should do to test this, and what other possible problems could be?