Constant noise inside upper left of machine

A constant whirring fan like noise suddenly appeared on my older MacBook Pro yesterday. It seems to come from inside the top left hand corner of the machine. I have spent several hours reading the MANY postings of people have the exact same problem. It is astounding how many people are having this very same problem. I read all the postings, done everything suggested: installed the fan control program, reset the SM whatever, monitored the CPU's in Activity Monitor, I have done EVERYTHING suggested. No one has resolved this issue short of taking the machine in for repair and/or replacement. My machine is older and no longer covered. Since this problem is so widespread and prevelant it does not seem fair that all of us inflicted with this constant noise should have to pay for repair! Why will Apple not resolve this? Anyone? Help!

OK--so it likely is the fan and not the hard drive. I gather the noise is there all the time and not just when the fan speeds up? It could be something mechanical, like a bearing starting to go out or even some piece of trash that has gotten trapped and is rattling around. Do both fans spin at around the same speed? And does the buzz change with the speed?
You probably are hearing the fan, but to be sure that the noise isn't coming from the left speaker, temporarily mute your volume to check.
It may be that the bearing is starting to go, but the fan is still working well enough that you don't get an error code on the Apple hardware test. But bearings usually start going slowly, rather than suddenly as you describe. This leads me to think that possibly some piece of trash got into the fan blade area and is maybe caught between a fan blade and the housing, and is just making noise. If this is the case, it may eventually go away as suddenly as it came. I had a leaf in my truck heater fan that caused a buzz for a surprisingly long time, but it finally broke up and blew out.
Probably the best course of action is to monitor the fan for a while and try to tolerate the buzzing noise. Check the fan speed frequently with iStatPro to be sure it is spinning at close to the speed of the right fan. As long as it is doing this, it will be cooling your Mac properly.
If the fan is actually failing, it would be expected to spin ever more slowly and erratically, and at some point in time, you would get an error code with "MOT" if you ran the extended version of the Apple Hardware Test. If this happens, it will be time to have it replaced.
Good luck!

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You can also run the extended version of the Apple Hardware Test. It will be on one of the grey system discs that originally came with your computer. On your model, it may also be possible to boot to it by holding down "D" as you boot up. If the AHT detects a hardware problem with your fan or hard drive, you will get an error code.
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Message was edited by: tiagop

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