kalinux

Level 1 (0 points)

Q: USB port off

Hello ,

I have an Mac Pro 2008 and after I've plugged in an USB 4 port hub , 3 smartphones on the same time , the USB ports stop working .

I've tried to reset pram but it seems that the keyboard do not work at all . (no light , and the usb mouse do not light neither )

When I plug an USB key (which have an activity light) , it blinks few times and after that it stops and the key is not mounted .

Any idea what should I do ?

Regards,

Calin

Posted on Nov 15, 2015 1:59 PM

I have this question too

Q: USB port off

All replies

Helpful answers

by lllaass,

lllaass Nov 15, 2015 2:36 PM in response to kalinux
Level 10 (189,435 points)

Desktops

Nov 15, 2015 2:36 PM in response to kalinux

Try resetting the SMC
Intel-based Macs: Resetting the System Management Controller (SMC)
Reply options

Link to this post

by kalinux,

kalinux Nov 15, 2015 3:23 PM in response to lllaass
Level 1 (0 points)

Nov 15, 2015 3:23 PM in response to lllaass

No . it doesn't help .
I've tried
1. stop/unplug/wait/plug/wait/start .
2. remove the battery
3.press the switch on the middle/back of the mainboard

none of these action worked for me .
Reply options

Link to this post

by lllaass,

lllaass Nov 16, 2015 7:56 AM in response to kalinux
Level 10 (189,435 points)

Desktops

Nov 16, 2015 7:56 AM in response to kalinux

If you can successfully boot the Mac then boot and open System Profiler and see if the USB hardware is listed.
OS X: About System Information and System Profiler - Apple Support
Reply options

Link to this post

by kalinux,

kalinux Nov 16, 2015 12:08 PM in response to lllaass
Level 1 (0 points)

Nov 16, 2015 12:08 PM in response to lllaass

You can see I've bought two USB cards .
One is working USB3.0/Concentrator and other it doesn't USB/USB2.0 HUB .(VIA Labs, Inc )
The Bus USB (embedded USB ) seems to be recognized( we can see 4 entries ) but none is working.
Reply options

Link to this post

by lllaass,

lllaass Nov 16, 2015 1:03 PM in response to kalinux
Level 10 (189,435 points)

Desktops

Nov 16, 2015 1:03 PM in response to kalinux

I have no idea when the built-in ports are not work since they are identified.
Regarding the Via card, do you have drivers for the OSX version yo are running?
Reply options

Link to this post

by kalinux,

kalinux Nov 16, 2015 1:22 PM in response to lllaass
Level 1 (0 points)

Nov 16, 2015 1:22 PM in response to lllaass

Via card : I installed some driver from a chinese site but it doesn't work.

The problem with the USB card is that will not start working before the driver is loaded by the OS so I'm not able to use any startup key combination
(ex: reseting the PRAM or starting the bootcamp)
Reply options

Link to this post

by lllaass,

lllaass Nov 16, 2015 1:28 PM in response to kalinux
Level 10 (189,435 points)

Desktops

Nov 16, 2015 1:28 PM in response to kalinux

What OSX version are you running? If old enough an old USB 2 card may work
Reply options

Link to this post

by kalinux,

kalinux Nov 16, 2015 1:30 PM in response to lllaass
Level 1 (0 points)

Nov 16, 2015 1:30 PM in response to lllaass

10.11.1
Reply options

Link to this post