USB overcurrent notice - hub disabled
Hello Community,
after plugging an accidentally short-circuited device into the only USB-Port of my MacBook Air 2.1 A1304 (Mid 09), the Mac shut down instantaneously. I got it restarted via a PRAM- and SMC-Reset, but the USB-Port is not recognizing any devices any longer (although my external USB-Drive is at least powering up, but not mounting).
Ever since, the famous Popup „USB device was drawing too much power (…) USB devices have been disabled“ is showing up on every Startup from the installed Snow Leo SSD. System-Message-Buffer (via Terminal: sudo dmesg) shows: USB Notification: The device "EHCI Root Hub Simulation" @ 0x24000000 has caused an overcurrent condition. The hub it is attached to has been disabled. The USB Hub is no longer listed in the Profiler.
I downloaded the Snow Leo Combo-Update and installed it - with no effect. Guess it's a hardware-, not a software-issue, since booting with the Alt-Key won't show any plugged USB-drives either.
Google says: USB-controller failure - Replace your Motherboard.
Can that be true?! "USB-Prober" says in its "Hub Descriptor", the disabled device is a "Gang switched standalone hub with global overcurrent protection". What kind of "protection" is that, if the USB-Port is disabled permanently, upon noticing an overcurrent?
I'll be glad about any advice to re-enable my USB-Port without replacing the motherboard 🙂
Thanks in advance,
André