Lenovo ThinkCentre M91p Hardware Maintenance Manual - Page 72
Undetermined problems, d. Extended video memory
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Message/Symptom FRU/Action 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. Network Adapter Intensity or color varies from left to right of characters and color bars 1. Display 2. Video adapter (if present) 3. System Board No power or fan not running See "Power problems" on page 33. Non-system disk or disk error-type message with a known-good diagnostic diskette. 1. Diskette Drive 2. System Board 3. Diskette Drive Cable Other display symptoms not listed above (including blank or illegible display) 1. Display 2. System Board Power-on indicator or hard disk drive in-use light not on, but computer works correctly 1. Power switch/LED assembly 2. System Board Printer problems 1. Printer 2. System Board Program loads from the hard disk with a known-good diagnostics diskette in the first 3.5-inch diskette drive 1. Run the Setup and Utility program 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 66 ThinkCentre Hardware Maintenance Manual