USB problems can usually be fixed by reinstalling the USB drivers.
The XFX nForce 750i SLI motherboard has 6 onboard USB 2.0 ports, any of which can be used to connect a USB mouse. Like all hardware connections, USB ports require the installation of compatible drivers to the operating system before they can function properly. After driver installation, it is possible for driver files to get corrupted or erased. If you are having problems with your USB ports, such as your USB mouse failing to work when it is connected, you can fix the problem by reinstalling the motherboard's USB drivers.
Test the Mouse
Before you spend the time and effort reinstalling the motherboard's USB drivers, it would be a good idea to test the USB mouse on a different computer to make sure that it isn't the problem. If the mouse works, then you know your USB drivers need to be reinstalled.
Open the Device Manager
The Windows Device Manager is a management utility that controls all the hardware devices connected to your computer. Among the many tasks you can perform with the Device Manager is the installation and uninstallation of device drivers. Go to the Windows Start menu and type "devmgmt.msc" in the "Search programs and files" box. Press the "Enter" key on your keyboard to open the Device Manager.
Uninstall the Drivers
All six of the USB ports on your XFX nForce 750i SLI motherboard are controlled by a Universal Serial Bus (USB) controller. To reinstall the USB drivers, you first have to uninstall the controller. Double-click on the "Universal Serial Bus controllers" category near the bottom of the device list in the Device Manager, right-click on the "USB Controller" item and then select "Uninstall" to uninstall it from your computer.
Reinstall the Drivers
With the USB controller uninstalled, all the USB ports on your motherboard have been effectively reset. As soon as you reinstall the controller, the USB drivers will be automatically reinstalled and the USB ports will function properly again. Click on the "Universal Serial Bus controllers" category and then click the "Scan for hardware changes" button in the menu. The system scan will find the USB controller and the USB drivers will be reinstalled to your computer automatically. Your USB mouse should work again when you plug it in.
Tags: Device Manager, Universal Serial, your computer, 750i motherboard, controller drivers, controller drivers will