I'm running OS 10.7.5, and I have a recurring problem with the USB ports on my Mac mini. After several days of up-time, one or more of the ports will sometimes become non-responsive. This seems to be software related, because logging off and logging back into the machine always fixes the problem (as does a restart and a cold-reboot). I was thinking maybe the 'checklist' of device filenames somehow gets corrupted over time, and needs to be recreated.
![List List](/uploads/1/2/5/4/125492030/828883013.png)
Mac and USB input devices. On Mac OS X using current Audacity or legacy 1.3.12 or later, the following procedure should get sound from the USB audio input device into Audacity. This includes USB turntables, USB cassette decks and external USB audio input/output adapters.
Does anyone know how to refresh the list of peripheral devices without restarting, rebooting, or logging off? Ideally a terminal command?
I'm hoping not to have to keep shutting down the session each time this happens to get my list of connected devices back. Thanks very much for your suggestions for the newbie. Hi Korby, If you are having difficulties with USB devices such as you describe, I would suggest resetting your Mac mini’s parameter RAM, as described in this article - Specifically - Resetting NVRAM / PRAM. Shut down your Mac. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer. Press and hold the Command-Option-P-R keys before the gray screen appears. Hold the keys down until the computer restarts and you hear the startup sound for the second time. Release the keys. Thanks for using Apple Support Communities.
![Usb Usb](/uploads/1/2/5/4/125492030/130724920.jpg)
Best, Brett L. Brett L, Thanks for your suggestion, and for the links to the knowledge base articles. It was a good suggestion, and I was hoping it would solve my issue. I reset my NVRAM / PRAM and waited a few days. Unfortunately, I still have the same problem.
I don't think there's a 'fix' per se. I have an older Mac that runs OS 10.6, and never had this problem. This might best be served with a quick refresh of the ports when the operating system seems to lose touch with them.
If not, I'll just have to keep logging off, logging in. Thanks again for the help. Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site.
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