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My USB ports will only recognise USB2 devices

311 Views 7 Replies Latest reply: Apr 27, 2012 4:42 PM by ChrisWluther RSS
ChrisWluther Calculating status...
Currently Being Moderated
Apr 26, 2012 4:36 PM

Hi,

    This is a weird one.. My USB ports will only recognise USB2 devices now and only if they are powered (my back up drive for instance). I've talked to Apple who believe it's the motherboard but shouldn't the ports have failed completely if that's so? Machine is a Macbook Pro 15" Intel Core i5  2.4 GHz running Snow Leopard (tried Lion but lost too many good apps under that system). Also if I unmount my external back up drive, it's not recognised again unless I restart or interrupt power to the external USB 2 drive. Almost like the old serial devices!

Did a total erase and reinstall of Snow Leopard 10.6.8, tried a powered hub and Apple had me do all the usual key combo resets all to no avail so it looks like I'm going to need a muthaboard. It just nags me that it still sees USB 2 only. How can it fail just a bit and then stay that way??

Hope someone can help. Heck, it would be nice just to know I' not the only one who's ever had this happen!

Cheers,

              Chris.

MacBook Pro (15-inch Mid 2010), Mac OS X (10.6.8)
  • Wayne Contello Level 6 Level 6 (12,670 points)
    Currently Being Moderated
    Apr 26, 2012 5:07 PM (in response to ChrisWluther)

    What devices do you want your machine to recognize?  USB has a limit of 500mA so if your external drive is not powered and it draws too much power the ICs on your motherboard will shut off power to the device until it is unplugged.  Macs only support USB1.1 and 2.0 and will never support 3.0 (at least in my opinion).

  • ds store Level 7 Level 7 (30,305 points)
    Currently Being Moderated
    Apr 26, 2012 5:17 PM (in response to Wayne Contello)

    will never support 3.0 (at least in my opinion).

     

    They will eventually, they just want to give Thunderbolt a chance.

     

    Apple adopted USB2 a few years later when they were pushing Firewire,  they eventually gave in.

  • ds store Level 7 Level 7 (30,305 points)
    Currently Being Moderated
    Apr 27, 2012 11:18 AM (in response to ChrisWluther)

    You need a powered USB hub.

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