Lenovo ThinkCentre M55 Hardware Maintenance Manual - Page 81
Setup/Configuration see Starting the Setup Utility, Power Supply
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Message/Symptom FRU/Action Computer will not perform a Wake On LAN® (if applicable) 1. Check power supply and signal cable connections to network adapter 2. Ensure that the operating system settings are set to enable Wake on LAN® 3. Ensure Wake On LAN feature is enabled in Setup/Configuration (see "Starting the Setup Utility program" on page 47) 4. Ensure network administrator is using correct MAC address 5. Ensure no interrupt or I/O address conflicts 6. Network adapter (advise network administrator of new MAC address) Dead computer. See "Hard disk drive boot error" on page 51. 1. Power Supply 2. System Board 3. Riser card Diskette drive in-use light remains on or does not light when drive is active. 1. Diskette Drive 2. System Board 3. Diskette Drive Cable 4. Riser card Flashing cursor with an otherwise blank display. 1. System Board 2. Primary Hard Disk Drive 3. Hard Disk Drive Cable 4. Riser card Incorrect memory size during POST 1. Run the Memory tests 2. Memory Module 3. System Board "Insert a Diskette" icon appears with a known-good diagnostics diskette in the first 3.5-inch diskette drive. 1. System Board 2. Diskette Drive Cable 3. Riser card 4. Network Adapter Intensity or color varies from left to right of characters and color bars 1. Display 2. System Board No power or fan not running 1. See "Hard disk drive boot error" on page 51. Non-system disk or disk error-type message with a known-good diagnostic diskette. 1. Diskette Drive 2. System Board 3. Diskette Drive Cable 4. Riser card Other display symptoms not listed above (including blank 1. Display or illegible display) 2. System Board Power-on indicator or hard disk drive in-use light not on, but computer works correctly 1. Power Supply 2. System Board 3. LED Cables Printer problems 1. Printer Chapter 7. Symptom-to-FRU Index 75