I was paying bills this morning and my CoreDuo Macbook froze and hasn't really done shit since. It is connected to the charger, I tried resetting the PRAM and PMU, but neither helped. I'm thinking it may be a heat sink, but this is the first time it has frozen, and it has never shut down before. When I turn it on, everything is REALLY SLOW... it literally takes over an hour for some of my windows to open, and even then, the finder is not fully loaded. even to try clicking on the apple ---> restart takes 2 minutes for the computer to register it. any ideas what I could try???