Alright, so I am in need of some major help. First the tech specs, it's the all white version, not the newer aluminum ones(http://support.apple.com/kb/sp16). We bought this Mac roughly 4 years ago, have used it and has run like a charm since. As of about 1 year ago, it started becoming a little laggy and very small graphic glitches. For the past 3 months, it's gotten a lot worse, and after upgrading to Lion a few weeks ago, it has gotten horrendous. Giant graphical glitches across the board, and very slow and laggy. The only modification we have ever done t o this computer was put in extra ram to cooperate with Lion.