I have a 2.0GHz aluminum MacBook that is running slow (slow to boot, and slow to shut off) so I upgraded the RAM to 4GB (max for that model) and there is no speed boost in startup or shutdown (improvements in application launch times, however) I tried just about everything to speed this thing up (didn't reinstall OSX) I think that I may have a hard drive issue though. it is kind of loud and makes alot of noises. What do you guys suggest to speed things up? Has anyone else had this kind of issue before? Im running OS 10.6.6, by the way.