No Characters Appear On Screen - NEC HV8600 User Manual

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Are the power supply LED status lamps on each supply lit? If either
LED on a supply is off, the power supply is defective and must be
replaced.
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Is the power connector for the cooling fan connected to the system I/O
board (option board fan), the CPU base board (CPU fans), and the power
backboard panel #1 (memory fans)?
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Is the front panel power on indicator lit? If this LED is amber, a defective
power supply is indicated.
If the switches and connections are correct and the power outlet is functioning, a
power supply has probably failed. Contact your service representative for
assistance.

No Characters Appear On Screen

Check the following.
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Is the riser card fully seated in the system I/O board connector? The riser
card is the small card that the mouse and keyboard plug into.
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Is the keyboard working?
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Is the video display plugged in and turned on?
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Are the brightness and contrast controls properly adjusted?
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Are the video display switch settings correct?
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If you are using an option video controller board, verify that the video
controller board is fully seated in the system board connector.
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Is the video display signal cable properly installed?
If there are still no characters on the screen after you check the above, contact
your service representative or authorized dealer for assistance.
5-8 Problem Solving