hi guys, first of all , in BIOs USB HDD sometimes aren?t recognised but inside windows they?re working ok.Before i could try to help you i need some more basic information...How many devices have you installed on your laptop?Did you check in Device Manager how many USB energie are in use before you connect your external HDD?AS a last test , try to connect only your usb conversor in usb port without the hdd and check if same problem occur.please let me know this test result.regs,