Okay so here is the problem. I have 1TB Toshiba USB 3.0 external HDD. Yesterday I tired to connect it to my PC using USB 3.0 port. After connecting it to the computer, there was no Windows sound which you get when USB device is connected, however the LED indicating that device is working was blinking also I could feel that HDD was spinning. At this point, I am sure that my USB 3.0 ports are working fine on my PC as I tried connecting other USB 3.0 devices by conencting them to USB 3.0 port and they work perfectly. I have also noticed that when I connect the external HDD using USB3.0 cable (this cable: http://img.auctiva.com/imgdata/1/0/1/8/5/6/9/webimg/606062256_o.jpg) to USB 2.0 port it works without any issues. In addition, I tried using USB 2.0 cable (http://www.fonefunshop.co.uk/datacables/micro_11.jpg) and I plugged it into USB 3.0 port and the HDD worked perfectly fine. So considering that it works using USB 2.0 connection, but doesn't when USB 3.0 is used, I am assuming that I need a new connector (SATA to USB 3.0) or preferably a new enclosure with that connector. I would be very happy if anyone could share their opinion on this issue that i am having.