Troubleshooting USB problems for most part, fall into one of the following categories:
Hardware failures:
Got to-
Control Panel -> System -> Hardware -> Device Manager -> Universal serial bus controllers
If the root hub is being displayed with an exclamation mark with a yellow circle around it, then verify that the BIOS is correctly assigning an interrupt request (IRQ request) channel to the root USB controller since this is required for the device driver to get loaded. This is one of the first USB troubleshooting steps to be taken.
Once you plug in the device, if you don’t see an icon appearing in the lower right corner of your system tray, verify that the power requirements of the bus are not being exceeded. Generally, USB devices can draw a max of 500mA for each connection. If the device is indeed drawing more power than this, the port can get suspened. If the device is drawing lesser than 50mA or so, the port never comes active.
Problems with device driver configuration:
When the USB device is plugged in, the computer must be able to recognize the device without requesting for any device driver. If it does prompt you for a driver, log on to the website of manufacture of the device and determine if they have any device specific driver.
Cabling Fault:
USB cables are classified into slow speed (1.5 Mbps transfer rate – USB 1.0) and high speed (480 Mbps transfer rate – USB 2.0). All the latest USB devices are high-speed devices and if these are connected to a low-speed cable, it can cause signal distortion. Also check the power supply to the USB hub is configured properly.
Common USB problems troubleshooting:
Source : USB Troubleshooter
Source : All about USB Devices
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