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USB slots stop working suddenly from time to time

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linux-howto

http://askubuntu.com – After re-installing my 12.04 system an older problem re-emerged after a few days and installation of different programs: without apparent reason the external mouse and all other usb connected devices (including hdd) stop working. The hdd shows it has tension as it has a light there, and the external mouse flashes for a second when plugged. A different version of this problem was reported before. Please do not report this question as clone of the first, I'll delete the first one after getting some answers here. I keep it for now as example of the two answers there. None of them works here. Af (HowTos)