Some USB ports no longer working after installing Mountain Lion?

Some of my USB ports are no longer working after installing Mountain Lion onto my 21' 2011 iMac. I used to plug in my iphone 4S and charge it, or transfer files onto my iPad but none of the ports no longer work to do this. Funnily enough, other equipment plugged into the works. I have tried changing the cable. Any ideas?

In my experience, the USB ports on the back of an Apple monitor can be re-enabled simply by unplugging and plugging back in the device in question. You might also check to see that the USB Monitor hub shows up in System Profiler. My Apple monitor USB ports experienced no changes in moving to 10.4.7.
bd

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Hi Jeff,
Tried to reply with my iPhone but not easy! Anyway, back on the laptop now. Yes the crash was bad but Tek support at Prism Sound was really good. In the end I rebuilt the whole system on a new disk which took a couple of days with all the plugins, softsynths etc.... but there seemed to be no alternative in my case, and this was agreed with Prism sound as being the only alternative left to me. I still don't really know what caused the crash but ML and Orpheus are both working fine now. Let's face it, you'll have to update at sometime..maybe best to pick some time between projects On balance, I suspect that my problems were unique to my system and that your installation will go ok.
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In my experience, the USB ports on the back of an Apple monitor can be re-enabled simply by unplugging and plugging back in the device in question. You might also check to see that the USB Monitor hub shows up in System Profiler. My Apple monitor USB ports experienced no changes in moving to 10.4.7.
bd

Some USB ports no longer working after installing Mountain Lion?

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