peripherals not working

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http://forums.fedoraforum.org – Yesterday I did a software update and got 78 packages to load. When I rebooted, the system did neither detect USB sticks nor my 16GB extension on the extension slot; also Wifi does not work. With the live USB stick however the AAO works fine;e.g. I am writing this thread on my AAO; is there a general switch for the peripherals, which disables them? I would not like to restart from the live stick to install the system again since I have loaded various programmes; made various updates since end of August, when I started with Fedora 11. So I hope there is a simple command which allows to switch the peripherals back to work. I am a Linux newbie so please be kind to me and if there is a solution code would be welcome. (HowTos)