Lenovo 7523, 7721, 7715, 7774, 7706, 7719, 7749, 7799, 7773, 7705, 7717, 7718, 7522 Undetermined problems

Message/Symptom	FRU/Action
Non-system disk or disk error-type message	1.	Diskette Drive
with a known-good diagnostic diskette.
	2.	System Board
	3.	Diskette Drive Cable
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 switch/LED assembly
light not on, but computer works correctly	2.	System Board
Printer problems	1.	Printer
	2.	System Board
Program loads from the hard disk with a	1.	Run Setup and check Startup sequence.
known-good diagnostics diskette in the first
	2.	Diskette Drive
3.5-inch diskette drive
	3.	Diskette Drive Cable
	4.	System Board
	5.	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
Some or all keys on the keyboard do not	1.	Keyboard
work
	2.	Keyboard Cable
	3.	System Board

Undetermined problems

If this computer has a parallel ATA hard disk drive, make sure that the hard disk drive is jumpered as a master and the optical drive is jumpered as a slave.

1.Power-off the computer.

2.Remove or disconnect the following components (if installed) one at a time.

a.External devices (modem, printer, or mouse)

b.Any adapters

80Hardware Maintenance Manual