I am a long-time Mac user, but have never come across this problem before: My 6 month old Mac Pro has suddenly decided not to recognise any USB device I am conneting it to... Including two external herd drives and a Wacom tablet.... Any help much appreciated
OS x 10.8.4
3.33 GHz 6-core Intel Xeon
12 Gb Ram
Apologies for the bad spelling..... I have just spotted!
One thing I would try if I were experiencing this, is to create a small partition on one of your internal hard drives and place a fresh, vanilla installation of OS X on to it.
Boot into that new install, and test your USB devices there. If they are recognized, then that narrows things down to your present OS X installation.
You could also try resetting your NVRAM: Press and hold the Cntl-option-P-R buttons at boot sound. May not help at all, but you never know. It seems to mysteriously cure a lot of ills.
If nothing helps...............there is always Apple Care.
Thanks Studio K..... yes indeed the 'mysterious cure' of the NVRAM - Thank you, that did do the trick... panic over (for now)
cheers
6 month old Mac Pro suddenly no seeing any USB device connected
