i am having dell inspiron n5110 laptop. my right side and rear usb 3.0 ports are not working...they seems all dead. i format windows 3 times ...first win 7 then again win 7 64 bit...now win 8.1 pro.....still the problem remains to be same...i contacted dell...they are asking me to see a local technician coz dell diagnostic utility shows no problem with hardware...i tried updating drivers. i tried power management..i tried uninstalling usb controllers from device manager and then rebooting...still problem remains same...i did rerest bios to default after problem even then nothing changed. usb is enabled in bios...also after installing renseas 3.0 drivers or nec 3.0 drivers it tells USB 3.0 host controller not found...i tried fresco logic usb 3.0 drivers too....please help...i spent my hours and hours...