NEC SP B-Series manual Problems and Solutions

Problems and Solutions

Problem	Symptom	Solution
Modem board	No output from board.	Check interrupts (see Appendix C,
malfunction		“System Resources”).
		Check DMA channels (see Section 1,
		“Technical Information”).
Keyboard or mouse	Monitor has prompt, but cannot	Check that keyboard/mouse is plugged in.
malfunction	input data.	Check password (see Section 2, “Setup
		Utility”).
		Disable password (see Appendix C,
		“System Resources”).
		Replace keyboard (or mouse).
		Replace system board.
Monitor malfunction	Unable to synchronize display.	Adjust the monitor’s synchronization
		controls.
		Check that the monitor’s resolution
		matches the video setting or the video
		driver used.
		Check that the utility is not selecting a
		refresh rate/resolution that is not supported
		by the monitor.
		Check that the driver used matches the
		capabilities of the video controller and
		memory.
	Wavy display.	Check that the computer and monitor are
		not near motors or electric fields.
	Blank display.	Press any key and move the mouse to
		ensure power management has not
		blanked the display.
		Check that the monitor power switch is on.
		Check that the monitor cable is attached to
		the video connector at the back of the
		system.
		Check cable connections between the AC
		power supply and monitor.
		Adjust brightness and contrast controls on
		the monitor.
		Check connections between the monitor
		connector and the system board.
		Replace system board.
		Replace monitor.
CD-ROM/DVD drive	System power not on.	Turn system power on.
malfunction

Maintenance and Troubleshooting 4-7