Lenovo ThinkCentre Hardware Maintenance Manual page 86

Machine types: 7258, 7259; 720; 7267; 7268; 7269; 7270; 7279; 7280; 7290; 7296; 7297; 7298; 7303; 7304; 7306; 7307; 7408; 7413; 7487; 7491; 7506; 7508; 7514; 7843; 7847
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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.
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Hardware Maintenance Manual
c. Memory modules
d. Extended video memory
e. External Cache
f. External Cache RAM
g. Hard disk drive
h. Diskette drive

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