Q: macbook pro usb ports not working

Hi B,

Try an SMC Reset: http://support.apple.com/kb/HT3964

I have been struggling with this problem for weeks!  After resetting the PRAM and SMC, etc. I finally went to Apple to get the latest MAC OS update - installed it and restarted and voila!!! My USB port is now working again!!

SOLVED!!!!

I've been having the same issue. It comes and goes so it's hard to isolate. I have the latest system software and it still hasn't resolved the issue. It's the 'rear' USB port.

This solved the problem for me. One of my USB ports stopped working after I upgraded to Mac OS X 10.8 Mountain Lion (USB device was not detected when plugging it into this port). I resetted the SMC: solved!

Hi V,

Glad that worked for you.

SOLVED!

After the first two weeks, my USB Ports stopped working.

Just a while ago I've tried PRAM Reset, and it all worked out.

Restart >

Command + Option + P + R

holding the keys when the Apple sign doesnt appear yet on the screen,

it restarts and USB ports start working.

I've done everything, latest updates (both Lion and Mountain Lion), SMC, and PRAM. I have MBPR and both are working very well with everything. But the left one keeps reconnecting my iPhone 4S (iOS 6 Beta3) every 20 seconds. It doesn't do it with other iPhone 4 or iPod touch.

It's strange and don't know what to do.

I lost the use of one of my USB ports after I tried to use an external 3D Sound Card. 

The reset worked :Command + Option + P + R

Thanks I was glad it was not a dry joint on the port. :

Resetting SMC worked for me.

http://support.apple.com/kb/HT3964

Got the same problem on my MacBookPro8,1.

The PRAM reset (Restart -> cmd + option + p + r) worked for me

i have to ask smth. if i make this resseting SMC or whatever it said... will i loose any files... pictures music... applications?

surtalev, greetings;  No.

Ciao.

This worked perfectly for me thanks!

my usb ports stopped working after i upgraded to the mountain lion.

whitey999 wrote:

 

This worked perfectly for me thanks!

my usb ports stopped working after i upgraded to the mountain lion.

Glad that worked for you, and you're welcome.