Here's a fun one. I have a month-old MBP 2.5. I immediately upgraded it with 4GB of RAM from our good friends at Crucial that I had harvested from my 17" MBP. Both the 17" and the 15" tend to get very warm and both of them locked entirely after a while of playing World of Warcraft. I bought the Targus cooling pad with the built-in fans and used it for my 15". This worked for a while - kept things cool, no problems. After about a week or so, though, not only did the 15" occasionally lock up, but I occasionally saw lots of nasty screen artifacts and heard some unpleasant whirring noises. Thank goodness for AppleCare, right? I called Apple and they had me reset the P-RAM and try playing WoW for another hour. Same deal. I sent the system to Apple and received it back today with the following service descriptions: 607-2186 FAN ASSY, LT, M87 607-2187 FAN ASSY, RT, M87 016-0002 REMOVE: UNQUALIFIED PART So they replaced the fans and yanked my memory, saying it didn't pass muster. I work as a sales consultant at an Apple-friendly store, so I've heard the "unqualified part" business 1000 times. I put the RAM back in, started up WoW and, lo and behold, an hour later it locked up and crashed all over again. My question is, is it ACTUALLY the RAM for once? Is there a known problem with WoW? Is there something else I'm missing here? Thanks for reading/responding.