Toshiba Satellite U400 Maintenance Manual page 69

Check 2
Check 3
Check 4
Satellite U400/Satellite Pro U400/PORTEGE M800 Maintenance Manual
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USB FDD may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 3.
Connect USB FDD to each port embedded on system board.
If it does not work properly when connected to CN12, CN19, CN20 or all ports,
perform Check 4.
System board may be faulty. Replace it with a new one following the steps in
Chapter 4, Replacement Procedures.
Chapter2 Troubleshooting Procedures
2-25