Troubleshooting Procedures
2-34 [CONFIDENTIAL] PORTEGE M780 Maintenance Manual (960-809)
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.
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