To find information on your Lenovo product, please perform the following steps:
- How to find and download manual. Goto "http://support.lenovo.com/en_US/downloads/detail.page?DocID=HT077589"
- Open "User Guide" pdf
- Scroll and look for "Contents"
- Then, look for "Troubleshooting and computer problems" and click on "USB Problems"
- You are able to find solution for USB problems.