Troubleshooting Procedures   
2-34 [CONFIDENTIAL] TECRA A11/S11/P11/Satellite Pro S500 Series Maintenance Manual (960-784) 
Check 2  Connect USB FDD to other USB port and check if it works properly. If it does not 
work properly, perform Check 3 
Check 3  USB FDD may be faulty. Replace it with a new one. If the problem still occurs, 
perform Check 4  
Check 4  System board and USB / Sound board may be faulty. Replace it with a new one 
following the steps in Chapter 4, Replacement Procedures.