Q: "USB Devices Disabled" notification always showing
Hey guys! Some help would be much appreciated.
A few months ago my macbook pro (early 2011) took a fall and ever since the USB ports are not working and every time I try to connect something the usual message "USB Devices Disabled - Unplug the device using too much power to re-enable USB devices" appears. I took it to be serviced, they asked for more money than I could spend to change the logic board. Instead I found a Thunderbolt to USB adapter and moved on like this.
Recently, I installed El Capitan and ever since the installation the "USB Devices Disabled" notification does not go away. It pops up, I click "Close", it goes away and a few seconds later it's back on. It stays there for EVER.
Any ideas as to how to solve this?
Many thanks!
MacBook Pro (13-inch Early 2011), OS X El Capitan (10.11)
Posted on Oct 1, 2015 11:04 PM
Had the exact same problem with my 2010 Mac Mini. Upgraded from Yosemite to El Capitan 10.11.1 and immediately saw the USB error message--even with all my peripherals disconnected including a USB monitor. After reading some forums found that resetting the SMC (System Management Controller) fixed this problem on some Macs. Go here to do this: Resetting the System Management Controller (SMC) on your Mac - Apple Support. I added to this by resetting the PRAM (or NVRAM) when my mac was booting up from the SMC reset. How to Reset NVRAM on your Mac - Apple Support.
When my mac booted up, the system preferences was open and I had a notifications error (null error). I then quit system preferences, started it back up, selected notifications and the error was gone with all the notifications options available. I then connected all my peripherals and no more USB errors appeared. Everything seems to be back to normal. Will update this post if things change. Good luck!
On a side note, El Capitan seems to be run a bit snappier than Yosemite. We'll see.
Posted on Oct 26, 2015 10:11 AM