IBM 2256 See Power Supply Errors on, If network administrator is using, First device network

Message/Symptom	FRU/Action
″Insert a Diskette″ icon appears with a	1.	System Board
known-good diagnostics diskette in the first
	2.	Diskette Drive Cable
3.5-inch diskette drive.
	3.	Riser card
	4.	Network Adapter
Intensity or color varies from left to right of	1.	Display
characters and color bars
	2.	System Board
No power or fan not running	1.	See “Power Supply Errors” on page 71.
Non-system disk or disk error-type message	1.	Diskette Drive
with a known-good diagnostic diskette.
	2.	System Board
	3.	Diskette Drive Cable
	4.	Riser card
Other display symptoms not listed above	1.	Display
(including blank or illegible display)
	2.	System Board
Power-on indicator or hard disk drive in-use	1.	Power Supply
light not on, but computer works correctly	2.	System Board
	3.	LED Cables
Printer problems	1.	Printer
Program loads from the hard disk with a	1.	Run Setup
known-good diagnostics diskette in the first
	2.	Diskette Drive
3.5-inch diskette drive
	3.	Diskette Drive Cable
	4.	System Board
	5.	Riser card
	6.	Power Supply
RPL computer cannot access programs from	1.	If network administrator is using
its own hard disk.
		LCCM Hybrid RPL, check startup
		sequence:
		a. First device - network
		b. Second device - hard disk
	2.	Hard disk drive
RPL computer does not RPL from server	1.	Check startup sequence
	2.	Check the network adapter LED status
Serial or parallel port device failure (system	1.	External Device Self-Test OK?
board port)
	2.	External Device
	3.	Cable
	4.	System Board
Serial or parallel port device failure (adapter	1.	External Device Self-Test OK?
port)
	2.	External Device
	3.	Cable
	4.	Alternate Adapter
	5.	System Board

108Hardware Maintenance Manual