Lenovo ThinkCentre M58 Hardware Maintenance Manual - Page 72

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 and check Startup sequence. 2. Diskette Drive 3. Diskette Drive Cable 4. System Board 5. AC/DC power adapter PXE computer cannot access programs from its own hard Replace the hard disk drive disk. PXE computer does not PXE from server 1. Check startup sequence 2. Check the network adapter LED status Some or all keys on the keyboard do not work 1. Keyboard 2. Keyboard Cable 3. System Board Undetermined problems If you encounter undetermined problems, do the following: 1. Turn off the computer and the power. 2. Remove or disconnect the following components (if installed) one at a time. a. External devices (modem, printer, or mouse) b. Any adapter cards c. Memory modules d. Extended video memory e. External Cache f. External Cache RAM g. Hard disk drive h. Diskette drive 3. Turn on the power and the computer to re-test the system. 4. Repeat steps 1 through 3 until you find the failing device or adapter cards. If all devices and adapter cards have been removed, and the problem continues, replace the system board. See "Replacing the system board" on page 80. 66 ThinkCentre Hardware Maintenance Manual