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USB not working on 10.6.2 compaq mini 700


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I followed the terrific guide you posted here to install Snow Leopard 10.6.2 con a compaq mini 700 with a very succesfully results. I completed every single step and now everything is working BUT the USB. When I insert a pen drive it shows this message:


System Extension Cannot be Used:


The System extension "/System/Library/Extensions/IOStorageFamily.kext" was installed improperly and cannot be used. Please, contact...



It's courious, because if I run the computer with the USB inserted, I can unplugged and then plug it without problems, it works. But if I run the computer without pen drives plugged, I cannot then insert them because they are not recognised.


Do you know what can I do?


Thank you!

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