We've had a MacBook since the summer and it'd been great. Two weeks ago, following a firmware update, it began whirring noisily during everyday use We took it back to the store and they sent it off for checking up. I went to collect it yesterday as they said it was fixed - they'd replaced the fan. We booted it up in the store and it was still whirring/vibrating away. The guy then put an even more recent firmware update onto it and it still did the same thing. The more senior tech guy said "seems unusual - I'll send it back again" Later on that afternoon, we got a voicemail saying there's nothing more they can do, and that this is within normal range for a MB. Also, we can't get a refund as it is more than two weeks old I don't want a refund - I want a MB that works like it did. Are they really saying that it is acceptable for MBs to run this noisily/vibrating strongly? (Also, surely the "two weeks old" thing is unfair - it was fine for 5 months until this firmware update messed it up) We have got to go to the store on Monday with our line straight. What do you think we should do? Insist on a replacement? Accept how it is? Offer to pay the difference and trade up to a MBP?? We're gutted about this - help much appreciated.