USB 3.0 don't work, I tried everything

Hello!

I've got Inspiron N5110.

I've been searching on forums at least 3 hours, found many sollutions, but none of them works for me. First the right one stopped working and few hours later the back one did so. USB 2.0 and eSATA work fine.

I tried Renesas driver, chipset updating. deleting all USBs from device manager, Wistron driver, diagnostics by BIOS and Dell support center checkup. Computer says nothing wrong, but USBs still don't work.

It didn't happen while using. I plugged my mouse in and it worked. And when I did so later, it didn't, so I think it shouldn't be hardware issue.

I'm sorry for bothering you with this problem after many other people did, but I really need some helo with this.

Thank you for answer

David