So I just got a new MBP 13" back in April. Then a few weeks ago, I started getting these "You must restart" crashes out of nowhere. They weren't really specific to any task I was doing, but I noticed it happened most either while browsing the internet, or directly when opening the lid after it slept over night. It was just a bunch of random Kernal Panics that didn't really point to one specific thing. I suspected Google Chrome, but after an uninstall (deleting complete Chrome folder) and reinstall, still happened. Then just removed Chrome altogether and went to Safari, still happened. Went to the genius bar and they did a few things that didn't work and said that they wanted to do a fresh install next. I hadn't backed up my system, so I bought an external, picked up my MBP, and took it home and did it my self. I backed up, then did a full reformat of the hard drive and did a fresh install of Lion. Restored my stuff from my backup. All was well for almost 2 days. Then bam, it happens again. So I thought maybe I may have restored whatever software problem was there before I reformatted? But then I decided to test the RAM I put in it. About a week after I bought the MBP, I upgraded to 8GB. Got it from Newegg. Here is the specific RAM I got: http://www.newegg.com/Product/Product.aspx?Item=N82E16820233215. Did a memtest over night, passed! But was still getting the problem. So I took the RAM out and put the factory RAM back in, and the problem hasn't happened since. And it's been about 5 days. Before, it was happening everyday, sometimes up to 3 times a day. So I guess it's safe to assume that the RAM was the issue? Even though it passed the memtest? Only thing is, how do I go about getting them to warranty it? What do I tell them? Do you guys think that was even the problem or do you think it will happen again?