Lenovo ThinkCentre M55 Hardware Maintenance Manual - Page 82

Message/Symptom FRU/Action Program loads from the hard disk with a known-good diagnostics diskette in the first 3.5-inch diskette drive 1. Run Setup 2. Diskette Drive 3. Diskette Drive Cable 4. System Board 5. Riser card 6. Power Supply RPL computer cannot access programs from its own hard 1. If network administrator is using LCCM Hybrid disk. RPL, check startup sequence: a. First device - network b. Second device - hard disk 2. Hard disk drive RPL computer does not RPL from server 1. Check startup sequence 2. Check the network adapter LED status Serial or parallel port device failure (system board port) 1. External Device Self-Test OK? 2. External Device 3. Cable 4. System Board Serial or parallel port device failure (adapter port) 1. External Device Self-Test OK? 2. External Device 3. Cable 4. Alternate Adapter 5. System Board Some or all keys on the keyboard do not work 1. Keyboard 2. Keyboard Cable 3. System Board Undetermined problems Check the power supply voltages (see "Hard disk drive boot error" on page 51) If the voltages are correct, return here and continue with the following steps. 1. Power-off the computer. 2. Remove or disconnect the following components (if installed) one at a time. a. External devices (modem, printer, or mouse) b. Any adapters c. Riser card d. Memory modules e. Extended video memory f. External Cache g. External Cache RAM h. Hard disk drive i. Diskette drive 3. Power-on the computer to re-test the system. 76 Hardware Maintenance Manual