My precious 2.0 white macbook with 2 gigs of ram hasn't been a happy camper as of late. It tends to squeal, scream, shriek and crackel from its speakers randomly and with no cause or counter effect. It happens when there is something making sound, it happens when there isnt. It happens when I am taxing it and it happens when i'm not. It isnt that big of a deal. But I don't want my precious to go esplodey on me. Help?