El Capitan Bugs: USB Ports Not working + Shut down / Restart Problems

SOLUTIONS THAT WORK:

I have a MBP 13" late 2012 running Sierra 10.12.2, a Blue Yeti Pro and Screenflow simultaneously on two monitors.

First, sometimes a Yeti will just shut down the USB ports... like kill them and give you the "The device is drawing too much juice from the port, so I killed it," message. Unplug everything and shut Mac down. PLUG NOTHING into the USB and re-start. Change cables on the Yeti (my problem happens when I plug in the Yeti's cable WITHOUT the mic attached, so it's the cable that comes with the mic). After it recognizes the Yeti with the new cable you can switch back (until it happens again).

Secondarily, I CONSTANTLY have to go to System Preferences-Sound and then go to the "Input". Sometimes the Mic is highlighted, sometimes not. If not, I change to it. THEN even if it is selected, I have to slide the input volume slider back and forth before the Yeti works.

Hope this helps!

I haven't checked out all the multiple problems you mentioned except the restart and shut down. I found a temporary solution to that by using the Guest side. In System Preferences Users and Groups change your settings to show your name or icon in the right side of the menu bar, click on that, go to Guest side and sign out from there or just go to Login Window and sign out from there. I shortened my password to make this faster.

I have exactly the same problem. My USB-Hubs aren't working anymore. If I plug in the Apple Keyboard to the USB it works, but nothing else does. 😟

See if the info in this topic will help: usb el capitan

Check library>extensions for Native Instrument kext-files or other third party kext-files, put them in a temp folder or something one by one.

My MBP wouldn't reboot with the NI kext-files in the extensions-folder.

MacBook Pro late 2011, 16 GB. Plustek 8200i AI USB film scanner with Silverfast seems to lose connection randomly and hangs after El Capitan installation. Tried PRAM reset and SMC with no improvement.

SSame problems all around, I have reinstalled several ( about 7) times the El Capitan ...and then reformat my SSD Drive , download the Yosemite and made a boot SD with the YOSEMITE.Finally I installed the Yomesite, but I can not recover my file s from my external NAS throuhgth Time Machine !!! Hope for a quick solution from Apple !!! Such a waist of time and ....

Have you tried resetting the SMC? Resetting the System Management Controller (SMC)

I have the same USB port problem. I can watch my printers go to idle then offline back and forth - they went offline full time after about 5 minutes. Second clean install. I have a mid-2007 24" iMac using all USB drives including my boot drive. Drives appear to work OK but my ScanSnap, Brother and Canon printers, Epson V600 do not want to work full time. ScanSnap worked, did a scan then bounced on and off line like the printers now off line. If I boot via another disk on same hub into 10.5 everything works just fine, so I am pretty sure that this is a software issue, not hardware, unless it has something to do with the old USB drivers on older machines.

Sure wish Apple would fix - this is a big problem.

According to some of the research I have done, El Capitan has a new USB stack which introduces all sorts of questions. I am skeptical of the solution offered by the genius as they have made some pretty awful suggestions to some of my friends. How old is your computer?