Black Box ACXMODHR, ACXMODH4, ACXMODH2, ACX1MR Troubleshooting 6.1 Blank Screen, Page, ACX1MT

Chapter 6: Troubleshooting

6. Troubleshooting

6.1 Blank Screen

CPU module, rear view CON module, rear view

Figure 6-1. Blank screen.

Table 6-1. Blank screen troubleshooting.

Diagnosis	Possible Reason	Measure
LED 3 off	Power supply	• Check power supply units and the connection to the power network.
LED 1 on or LED 2 off	Connection between the CON unit and the CPU unit	• Check interconnect cables and connections.
		• Check DVI-D cable to CPU.

CPU unit: LED 3 red or yellow No video signal detected by source (computer, CPU)

•Download DDC information from console monitors (see Chapter 5).

Reboot CPU if necessary.

	No monitor detected	• Check connection, length, and quality of the DVI-D cable to monitor;
		tighten cable thumbscrews.
CON unit: LED 3 red or yellow
		• Check connection, length, and quality of the interconnect cables
	No video signal detected from CPU unit	between the units.
		• Download DDC information from console monitors (see Chapter 5).
		Reboot CPU if necessary.

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