z170 pro4 usb3 ports not working with seagate

i have just purchased a new pc and it has a asrock z170 pro4 motherboard installed . my problem is that i have a seagate 2tb backup slim external hd  and when i connect it to any of the rear usb3 ports strange things happen such as when i am transfering a movie on to my seagate the transfare stops half way through and and my windows 10 start button becomes unresponsive and my clock vanishes and i have to press the reset button on the front of my pc. when i use another usb3 port on the rear the speed of the transfer is very slow . the two usb3 ports on the front of my stryker case work fine . the only other drive i had to test was a sandisk extreme flashdrive and it works on all the usb3 ports that the seagate did not . i have checked the seagate for errors using the seagate utility software and it passes all the tests. do i have a faulty motherboard ? if so i will have to return this pc back to zoostorm as they are the ones who built it . any help would be great . and just to clarify , my previous hp envy pc which i had until 5 days ago worked fine with the seagate .i looked on the asrock website and i dont see any usb updates for my motherboard  can anyone help me with this problem ? i am using windows 10 by the way

Edited by tredstone - 02 Dec 2015 at 2:16am

hi

Edited by tredstone - 02 Dec 2015 at 9:42am

yes i know i am getting confused myself , there are 6 usb3 ports on the back of my pc .only two seem to be working properly for the seagate , that leaves 4 usb3 left , 3 of which work with the flash drive and the last one does not work at all with either drive but all six do supply power because i plugged my led keyboard in all of them to test . its strange . two of the usb ports were hidden at the top i did not see them the first time around.

Edited by tredstone - 02 Dec 2015 at 7:10pm

thanks for your reply. i decided to reset the pc back to factory defaults and it seems to have fixed the issue. the only slight problem is i use a usb extension dock it works on all 5 of the rear usb3 ports but on the sixth  it does not work correctly but if i directly plug the drive in to the usb without the extension it works fine .i dont know why that  port will not play nice with the extension

wardog wrote: No rhyme or reason either. < id="kpm_plugin" ="application/x-KPMPlugin">

OC'ing a bus may have been your sole issue though.