Lenovo 4228, 4223, 4229 manual Check power supply and signal cable connections

Message/Symptom	FRU/Action
Computer will not RPL from server	1. Ensure that network is in startup sequence as first
		device or first device after diskette.
	2.	Ensure that 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 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 37)
	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)
	7.	Replace system board
Dead computer. See “Hard disk drive boot error” on page	1. Power supply
49.	2.	System board
Diskette drive in-use light remains on or does not light	1.	Diskette drive
when drive is active.	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	1. System board
diagnostics diskette in the first 3.5-inch diskette drive.	2.	Diskette drive cable
	3.	Network adapter
Intensity or color varies from left to right of characters	1.	Display
and color bars	2.	Video adapter (if present)
	3.	System board
No power or fan not running	1. See “Power Supply Problems” on page 49.
	2.	Replace system board
Non-system disk or disk error-type message with a	1. Diskette drive
known-good diagnostic diskette.	2.	System board
	3.	Diskette drive cable
Other display symptoms not listed above (including blank	1. Display
or illegible display)	2.	System board
Turn on indicator or hard disk drive in-use light not on, but	1. Power switch/LED assembly
computer works correctly	2.	System board

52ThinkStation Hardware Maintenance Manual