Lenovo ThinkStation C20x 4269 Hardware Manual page 93

e. External Cache
f. External Cache RAM
g. Hard disk drive
h. Diskette drive
3. Power-on the computer to re-test 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.
Chapter 8. Symptom-to-FRU Index
87