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Modèle début 2011, A1278 / 2.3 GHz i5 ou processeur 2.7 GHz i7.

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Mac made wierd sound, slower now

Just got home after having rode on my bicycle with my Mac in a bag. Last time I used it, it was drained for battery, but when I got home and plugged the power in and turned it on, it said this weird sound. So I turned it off. Even after it was turned off, it made the sound. Then I unplugged the power and the sound lasted another 5 seconds before it stopped. Then I turned my Mac back on, the sound was gone, but now it seems run a bit slower.

I don't know if my Mac has gotten any knocks when it was in my bag.

Took this video of the sound just when I had unplugged the power:

Anyone know what this can be? Thanks!

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How about downloading this app so you can double check to make sure your fans are not in trouble: TG Pro.

To double check to see if your drive is having problems I would recommend connecting your system to another Mac via either a FireWire or Thunderbolt cable. Then start up your Mac in Target Mode which will allow you to access from the other Mac your systems drive. Using Disk Utility on your friends Mac you should be able to check you drive out. But before you do you may want to copy off anything important just in case the drive is in trouble.

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When using TG Pro, what shall I be looking at?

Wouldn't it be fine using Disk Utility on my own Mac? Anyways, I've already run Disk Utility on my Mac, and it said everything was fine


TG Pro allows you to see the health of the thermal sensors as well as the state of the fans.

Disk Utility can be misleading you here. The problem is you can't run it from the drive you are currently booted up with (if you can't do Target Mode). This is where you want to create if you don't already have a bootable external drive. I would recommend getting a 16 GB or larger USB thumb drive to create your emergency boot drive. Using Disk Utility delete the FAT32 partition and create a GUID partition map with a Mac OS journaled partition. Then run the OS installed from your Mac (if you don't have it download it from the App Store) to install the OS onto the thumb drive. Last thing here is copy over the installer app to the thumb drive in case you need it in the future.

Now with your thumb drive as the boot disk you should be able to run from Disk Utility on the thumb drive the repair options for both Permissions & Disk.

But before you do this make a full backup on an external drive just in case!


Could you please tell me how I check this with TG Pro?

Had a bootable backup which I booted from and used Disk Utility. As it runs El Capitan, I couldn't check the permisions. But did run the first aid. First time I ran it on the harddrive it said it couldn't make the harddrive passive. I then tried it 2 times more, but both of these times it said everything was fine.


TG Pro only checks the sensors it can't check the drive. Sounds like your system still booted up on the internal drive . With the bootable drive connected, start your system up and hold the Option key so you get to the Drive Manager and then select your external drive. That should do it.


Okay, I've tried speeding up and down the fans with no problems. I assume that's what I should do?

I'm sure I was on the bootable backup.


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That's a dead/dying drive. Replace the hard drive with a 500 GB SSD Hybrid 2.5" Hard Drive from iFixit. You may be able to back up your data using an external drive enclosure or a SATA to USB adapter, but if the drive is dead, it's dead.

The sound you heard was the spindle motor trying to spin up but because of an internal blockage, it cannot do so. Additionally, you can't open up hard drives without destroying them. Once you introduce dust into a hard drive, the entire thing may fail to work ever again.

Image 500 GB SSD Hybrid 2.5" Hard Drive


500 GB SSD Hybrid 2.5" Hard Drive


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Thanks for the answer.

After having used it for 2 days now, it doesn't seem to be any slower than before actually. Instead, it doesn't always respond when I click on the trackpad, though if I tap there's no problem. This wasn't a problem before. Any way the sound and the trackpad issue could be related?

The bootup time have also increase a lot!


It takes my Mac about 30 seconds from the startup sound to the Apple logo appearing and then an additional extra time for the loading bar to complete. Is that normal?

Also just took the extended Apple Hardware Test. It said there was no problems...


It does sound like the drive is making the noise here. I would stop using the system and look at getting a new HD.


I would do a backup as soon as possible ( Apple Time capsule) or something like that. Then I would look for a replacement Hard Disk drive.

Replace the HDD and the do a restore. That way you will not loose all your files. But do it ASAP before the drive goes completely bad.


If you want, depending on how much you use it and how much you store on it, you could use an ssd and that would never get damaged, would make for snappy boot times, and load up programs almost instantly!


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Mattias Damsgaard sera éternellement reconnaissant.
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