Hello everyone, I am using a 3 week old 2011 iMac with Lion. I have been having some problems. The first is that flash videos cause my system to "flip out" what I mean by that is that it will either freeze my machine or the video will flicker or get stuck (almost like a stuck record). I'm also having problems with memory. I have 4gb of ram and things seem to run choppy, is 4gb too little? If so can someone tell me what a good type of ram would be on Amazon? Thanks.