Usb ports not working on mac

• The USB ports stopped working.
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I just ordered the USB tester and it will be delivered within the next 8 days. Now for the logic board you gave me hope to proceed in this direction , Is there a way for me to determine which chip or part or controller on the board that need to be replaced?. To be clear its the mis-match of the AC transformer for the given device that likely killed your system.

Make sure they are matched correctly. As for the repairing Not so simple to answer as their are still quite a few parts one would need to test out and trace out in the schematics.

1. Check the Connection

This is beyond a typical DIY person. As for AHT I like the term 'Horizon' to describe this. Just like you can't see over the horizon AHT has its limits! The horizon for it is the digital side of the system inner-world once you get to the outer interface side of the circuit outer-world it can't test these things without a loopback tool.

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Over the years the loopback tool was dropped as it was no different that a known good device or using a USB test tool I pointed you to if the power side of the connection was in question. Show 7 more comments.

Fix MacBook, Mac Pro USB Ports Not Working Problem

Andre Lefebvre. Select a Language: Help Translate iFixit. When ports and other Mac components tend to be glitchy or unresponsive we need to reset the chips that are basically in charge of these actions. Now restart you Mac and hold these keys down as the Mac starts-up. When this is done your Mac will restart again on its own and once you hear the start-up chime a second time go ahead and let go of the keys. Once the Mac is loaded and running check the USB ports and see if they are working properly.

Start by ensuring that no applications are running and if they are go ahead shut them down.

Troubleshooting Unresponsive USB Ports on the Mac

Now put your Mac to sleep then wake it back up. Next restart your Mac and once it has completely restarted and running again you need to turn right around and shut it down. Reinsert the battery and turn your Mac back on. Once everything is running and loaded up go ahead and test your USB ports again. We all hate going without our beloved Macs so hopefully one of these methods solved your issues so you can avoid your computer being taken apart and even restored to its default state.

Follow me here: This site uses Akismet to reduce spam. I hope to get a new iMac when they come out. USB ports not alwasy working?

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Browse Search. Ask a question. User profile for user: Henry Cline1 Henry Cline1. Video Speciality level out of ten: I find that the USB ports on my 27" iMac do not alwasy work after restarting.

What to do if Mac USB devices are not working

Looking for guidance and where to start troubleshooting this situation. Thanks, Henry. All replies Drop Down menu. Loading page content. Eric Root Eric Root.