Lenovo ThinkCentre M75s Gen2, Hardware Maintenance Manual, Page: 41 / 90

Miscellaneous error conditions
Message/Symptom
FRU/Action
Changing display colors Display/Monitor
Computer will not power-off. See “Hard disk drive boot
error” on page 32.
1. Power Switch
2. System Board
3. Riser card, if installed.
Computer will not RPL from server
1. Ensure that the network is in startup sequence as the
first device or the first device after diskette.
2. Ensure that the network adapter is enabled for RPL.
3. Network adapter (Advise network administrator of
new MAC address)
Computer will not perform a Wake On LAN
®
(if applicable)
1. Check the power supply and signal cable
connections to the network adapter.
2. Ensure that the operating system settings are set to
enable Wake on LAN.
3. Ensure that the Wake On LAN feature is enabled in
Setup/Configuration.
4. Ensure that the network administrator is using the
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
32.
1. Power Supply
2. System Board
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
Blank screen except for flashing cursor.
1. System Board
2. Primary Hard Disk Drive
3. Hard Disk Drive Cable
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
1. See “Hard disk drive boot error” on page 32.
Chapter 4
.
Service checkout and symptom-to-FRU index
35