Hi. I installed a backtrack 5 linux based on ubuntu on external hdd. Everthing worked well. Then I did re-install and during loading linux I see : new high speed USB device using ehci_hcd and address 5 . Then i can do only restart and Goodbye. I don't know what is going on.? Anyone had the same problem? I've done yet everything. Cleaning all external disk and so on. Thanks.