IBM 6645, 6644, 6646 manual Error Symptoms Action/FRU Real-Time Clock, Video and Monitor, USB Ports

Table 2-3 Error Symptoms List (Continued)

NOTE: To diagnose a problem, first find the error symptom in the left column. If directed to a check procedure, replace the FRU indicated in the check procedure. If no check procedure is indicated, the first Action/ FRU listed in right column is the most likely cause.

Error Symptoms	Action/FRU
Real-Time Clock
Real-time clock is	Ensure that the information
inaccurate.	in the Date and Time of
	BIOS Setup is set correctly.
	See “Date and Time” on
	page 21.
	Load default settings.
	CMOS battery.
	System board
Video and Monitor
Video memory test failed.	Remove all non factory-
Video adapter failed.	installed cards.
	Load default settings
	(if screen is readable).
	System board
Display problem:	Monitor signal connection/
- Incorrect colors	cable.
- No high intensity	Monitor
- Missing, broken, or	System board
incorrect characters
- Blank monitor(dark)
- Blank monitor(bright)
- Distorted image
- Unreadable monitor
- Other monitor problems
Display changing colors.	Monitor signal connection/
	cable
	Monitor
	System board
Display problem not listed	“Monitor” on page 70.
above (including blank or	Load default settings
illegible monitor).	(if screen is readable).
	System board

USB Ports

NOTE: Execute “Load BIOS Default Settings” in BIOS Setup to confirm ports presence before diagnosing any USB ports problems. Remove all external USB hubs.

52 IBM Desktop System HMM