Lenovo ThinkCentre M90t Gen 3 Hardware Maintenance Manual page 43

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e. External Cache
f. External Cache RAM
g. Hard disk drive
h. Diskette drive
3. Turn on the computer to retest the system.
4. Repeat steps 1 through 3 until you find the failing device or adapter.
If all devices and adapters have been removed, and the problem continues, replace the system board. See
Chapter 6 "Hardware removal and installation" on page 43.
.
Chapter 4
Service checkout and symptom-to-FRU index
37

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