Hello, I am a new MAC user. I bought a MAC Book PRO about 2 months ago, and it's been running geat until last night. Both Safari and Firefox3 are having trouble loading pages, and when I go to youtube....forget about it! I have to wait 5 or more minutes for the vidoes to load so that I can watch it without interuption. Because I'm so new to the operating system, I don't really know who to begin to troubleshoot the problem. Please help!! Thanks in advance!