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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Booting problems: Progress bar at the screen when booting, sound fails

Hi everyone, i'm having some troubles with my almost new iMac, and the problem is that i don't know if that is normal or not.

This is the thing:

When i start the computer, sometimes a progress bar is shown at the bottom of the screen, when this happens, te computer takes a very long time to start, and once it's done, some things don't work (sound, camera, mic).

If i restart the computer, usually everything turns to normal again, but i feel confused about all this, knowing i own an expensive computer and having to deal with this.

What do you think, is this normal stuff? have you ever heard of something like this?

I had an iMac 20 for a few years and never had a problem like this, in fact boot times where shorter.

Thanks you all in advance, and please excuse my english, i'm not an english speaking person.

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Try disconnecting the USB devices (other than the keyboard & mouse) any difference? If so you may have a bad cable or device.


I'm gonna try this and let you know, thanks a lot!


Dan, i've been trying what you told me for a few days, and everything seems to be fine. I guess the problem was in my wacom tablet, that was always plugged. Thanx a lot for helping me!


Hey, it's me again. Yesterday the same problem showed once again...


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OK - Lets give Apple Hardware Test a try and see what it shows: AHT Given the fact this is a fleeting problem you may need to run it a few times.

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Ok, I'll try this and let you know, thanx a lot!


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Agustin será eternamente grato(a).
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