The HP Compaq Dc5100 is a small form factor PC that is manufactured and developed by Hewlett-Packard. A "small form factor PC" functions like a desktop computer but is built to minimise its size. The HP Compaq DC5100 has two USB 2.0 ports in front and six at the back of the computer.
Loose Cable Connections
If the computer cannot recognise the USB device at all, make sure that it is properly connected to its port. Unplug the device and then replug it into a USB port in your HP DC5100. Reboot the computer if it still does not recognise the device, and then try plugging it into another USB port. If this does not generate positive results, the USB device may have a driver that you need to install before the device is recognised by the computer.
USB 2.0 Port Driver
Before the USB 2.0 ports in your HP Compaq DC5100 can start to function, the USB port driver needs to be installed to the computer first. You can access the driver from the motherboard installation disc that comes with the computer.
USB Device Problems
If a USB device is unrecognized by your HP Compaq DC5100 after trying to plug it into all the USB ports, the USB device may be malfunctioning. Try plugging another USB device into the computer and see if it is recognised. If it is, then you can assume that the USB device you were using is damaged.
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