FI re-sent this as I realized I did not send it in Plain Text Format the first time...ooops! Ok, so, I wrote in last month about my new iBook doing alot of freezing up and was told basically to send it in and have Apple take a look at it. So, I can follow directions and I did send it in. I got it back Wednesday and the note said they replaced the processor. Ok, good. Now it doesn't freeze any more. I did install an additional 128MB chip from another iBook (a 800MHz one, mine is a 600MHz). Yesterday I put the 'book to sleep for a few hours while I ran into town and when I came home and lifted the lid she started right up . THEN after about 30 seconds I get this loud whirring sound. What's that? I don't know. I did a hard shut down (nothing else worked), waited a few minutes and started it up again. Everything was fine. Today the same thing happened after it being asleep again, another hard shutdown....now (just now) it started the loud whirring noise and is still doing it as I type this.... What is this....anyone? Thanks, Fran